--- product_id: 4415618 title: "Brush Research GB41824 FLEX-HONE®, 4-1/8\" (105mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials" brand: "flex-hone" price: "₨2016" currency: SCR in_stock: true reviews_count: 13 category: "Flex Hone" url: https://www.desertcart.sc/products/4415618-brush-research-gb41824-flex-hone-4-1-8-105mm-diameter store_origin: SC region: Seychelles --- # Self-centering & self-aligning design 240 grit silicon carbide abrasive 4.13" diameter precision fit Brush Research GB41824 FLEX-HONE®, 4-1/8" (105mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials **Brand:** flex-hone **Price:** ₨2016 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your engine rebuilds with the ultimate precision hone! ## Quick Answers - **What is this?** Brush Research GB41824 FLEX-HONE®, 4-1/8" (105mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials by flex-hone - **How much does it cost?** ₨2016 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/4415618-brush-research-gb41824-flex-hone-4-1-8-105mm-diameter) ## Best For - flex-hone enthusiasts ## Why This Product - Trusted flex-hone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Proudly Made in the USA:** Trusted quality from the original FLEX-HONE® inventors, ensuring consistency and durability. - • **Versatile Crosshole Deburring:** Simultaneously deburrs and finishes in one setup—compatible with hand drills, CNC, and drill presses. - • **240 Grit Silicon Carbide Power:** Delivers a smooth, uniform finish on mild steel, stainless steel, cast iron, and softer ferrous metals. - • **Iconic Plateau Finish Technology:** Achieve rapid ring seating, superior oil retention, and extended seal life with the patented crosshatch pattern. - • **Engineered Oversize for Perfect Pressure:** Self-centering and self-compensating for flawless cylinder wall contact every time. ## Overview The Brush Research GB41824 FLEX-HONE® is a 4.13" diameter, 240 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its patented oversized, flexible abrasive globules create a self-centering, self-aligning, and self-compensating action that produces a superior plateau finish with an oil-retentive crosshatch pattern. Ideal for deburring and finishing hydraulic, pneumatic, and engine cylinders, this tool streamlines surface preparation and extends seal life. Made in the USA by the original FLEX-HONE® inventors, it’s a must-have for professional machinists and engine rebuilders seeking precision and efficiency. ## Description The FLEX-HONE® tool was originally created by Brush Research Manufacturing to deglaze cylinder walls in automotive applications. Brush Research embraced the benefits of a plateau finish and pioneered the concept of plateau honing culminating in the introduction of the FLEX-HONE® tool in 1972. The FLEX-HONE® has gained many nicknames over the years and including ball hone, ball style hone, flexihone, dingleberry hone, bead brush, glaze breaker and glaze buster. Flexible honing with the FLEX-HONE® tool produces an oil holding cross hatch pattern and a true plateau finish free of cut, torn and folded metal. Any type or size of cylinder can benefit from the FLEX-HONE®. These abrasive bead style brushes are produced in standard diameters from 4mm to 36 inches. Nine abrasive types are offered including Silicon Carbide, Aluminum Oxide, Boron Carbide and Diamond allowing the tool to be tailored to finish any base material. A choice of 11 different grit selections are available for precise control of finish parameters. The elimination of peaks results in rapid ring seating, better oil control, reduced seepage in hydraulic and pneumatic applications and provides better seal performance and longer seal life. Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and the list goes on and on. FLEX-HONE® tools are also very effective for deburring cross drilled holes, port radiusing and edge blending. Because of its unique construction, the FLEX-HONE® is self-centering, self-aligning, and self-compensating for wear so it does not require an elaborate set-up or special training. Deburring can be effectively automated and combined in the machining process to allow a complete cylinder finish in one operation or it can be employed as a secondary operation with equal results. Review: works great - works good as usual... a vital necessary tool in engine rebuilding... Review: Five stars! - The FLEX-HONE® is an outstanding tool for deburring and surface finishing! The 240-grit silicon carbide abrasive works perfectly on mild steel, stainless steel, and cast iron. It delivers a smooth, uniform finish with minimal effort. Durable and easy to use—highly recommended for automotive and machining applications. Great value for the quality. ## Features - [QUALITY]-Proudly Made in the USA. Quality and consistency you can count on made from the inventors and makers of the tool. - [DESIGN]-The FLEX-HONE is intentionally manufactured oversized. This engineered oversize creates the optimal amount of pressure inside the cylinder wall allowing the tool to be self-centering, self-aligning and self-compensating for wear and easy use. - [FINISHING BENEFITS]-Offered in a wide variety of grits to achieve specific finishing tolerances as well as a beautiful crosshatch finish. Ideal for rebuilding hydraulic and pneumatic cylinders, engine and brake cylinders, valve guides, pumps, compressors and more. - [CROSSHOLE DEBURRING]-Accomplish finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle from a hand drill, drill press or CNC equipment. - [240 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 24 - 32 Microinch (.6 - .8 Micrometer). - [WHAT'S INCLUDED]-1 Each of a GB Standard Duty FLEX-HONE: 4.125" (105mm) Bore Diameter, 4" Abrasive Part Length, 0.310" Shank Diameter, 13.5" Overall Length. For Use on Bore Diameters Between 3.751"-4.125". PLEASE NOTE: ORDER BY BORE SIZE. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002XUL1GW | | Best Sellers Rank | #8,354 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Flex Hones | | Brand | Flex-Hone | | Brand Name | Flex-Hone | | Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament | | Compatible Material | Other Softer Ferrous Materials, Stainless Steel, Mild Steel, Cast Iron | | Customer Reviews | 4.8 out of 5 stars 1,854 Reviews | | Grit Material | Silicon Carbide | | Grit Material Type | Silicon Carbide | | Grit Type | 240 Grit | | Included Components | GB 4-1/8" (105MM) 240SC FLEX-HONE | | Item Diameter | 4.13 inches | | Item Dimensions | 13.5 x 5 x 5.1 inches | | Manufacturer | Brush Research Manufacturing | | Material | Silicon Carbide | | Material Type | Silicon Carbide | | Model | GB41824 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | Part Number | GB41824 | | Recommended Uses For Product | Deburring, Finishing | | UPC | 843469144249 | | Unit Count | 1 Count | | Warranty Description | Manufacturer Warranty | ## Product Details - **Brand:** Flex-Hone - **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament - **Grit Material:** Silicon Carbide - **Grit Type:** 240 Grit - **Material:** Silicon Carbide ## Images ![Brush Research GB41824 FLEX-HONE®, 4-1/8" (105mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/61f9Ueb7-8L.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ works great *by J***E on August 25, 2026* works good as usual... a vital necessary tool in engine rebuilding... ### ⭐⭐⭐⭐⭐ Five stars! *by L***R on May 9, 2025* The FLEX-HONE® is an outstanding tool for deburring and surface finishing! The 240-grit silicon carbide abrasive works perfectly on mild steel, stainless steel, and cast iron. It delivers a smooth, uniform finish with minimal effort. Durable and easy to use—highly recommended for automotive and machining applications. Great value for the quality. ### ⭐⭐⭐⭐⭐ Barely Fit 3.6" bore. *by G***R on August 19, 2020* Buy exact fit to the .10" or one .10" larger Working on a 22r Toyota stock bore 3.6". This hone did it's job with a nice cross hatch. However, the hone just barely hit the bore walls. Maybe this is by design but I feel I should have gotten the 3.75" bore hone as my bore size is 3.6" If your bore is 3.5" then you would be fine. The hone would have a bit of pressure on the bore walls. If you plan on honing a 22r look for the next size up. The balls on the hone wore down Farley fast making flat spots on most the balls. So when you use this you do not want to hone one bore at a time. Make like 2 passes per bore to break in the hone tell you have broke the glazing off the bore walls and broke in the hone, then work on your cross hatch pattern. Over all I like this hone and it's ease of use but the fact that I most likely will not be able to use it again, I may get one more use from it in 5-8 years witch would pay for it self then but a stone hone would be more cost effective. If you build the same 3.5" size bore engine all the time this hone would be ideal. Cause you can just grab put in drill and hone (adding cutting oil). ## Frequently Bought Together - Brush Research GB41824 FLEX-HONE®, 4-1/8" (105mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Permatex 81950 Ultra Slick Engine Assembly Lube, 4 oz. , Red --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sc/products/4415618-brush-research-gb41824-flex-hone-4-1-8-105mm-diameter](https://www.desertcart.sc/products/4415618-brush-research-gb41824-flex-hone-4-1-8-105mm-diameter) --- *Product available on Desertcart Seychelles* *Store origin: SC* *Last updated: 2026-09-23*