I have to fasten 3 inch long bolts (5/16 head) into drywall/stud. Is this drill flute long enough to create a sufficient pilot holes?

Hmmm.... well, I would think if you anchored the shaft with the full 2 3/4 inch cutting screw exposed and sink it into the stud down to the chuck you might have a good pilot hole. The only thing that bothers me is that you said these are BOLTS not screws... so I don't know how much bite they will have to go that last 1/4 inch. so you may have to leave a bit of the shaft exposed to get the full 3" you will need. I hope that helps... hard to answer when I can't see what you are what you are working with. (I am a visual learner) ;) be safe and stay well.

Would it work with a craftsman drill?

Thank you for your question. The CO2135 Cobalt drill Bit has a rounded shank. If your Craftsman drill accepts round shank bit, then it will work. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from M-F 7a-7p CST.

Bosch Co2135 1 8 In X 2 3 4 In | Desertcart Seychelles

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Drill Like a Pro, Last Like a Legend

ROCK SOLID STABILITY - Thick web helix design ensures maximum rigidity and durability in demanding applications.
VERSATILE METAL MASTER - Engineered for light-gauge metal, stainless steel, titanium, cast iron, and more—your go-to bit for premium projects.
PRO GRADE SPIRAL FLUTES - Optimized spiral flutes deliver fast material removal and extended bit life for relentless efficiency.
HEAT RESISTANT POWERHOUSE - Drill through tough metals without overheating, sustaining performance up to 1100°F.
PRECISION START EVERY TIME - Split point tip eliminates walking and skating, so you hit the mark instantly—no center punch needed.

The Bosch CO2135 1/8 in. x 2-3/4 in. Cobalt Drill Bit is a high-performance, heat-resistant drill bit designed for precision and durability in metalworking. Featuring a thick web design and split point tip, it offers superior stability and no-walk starts, making it ideal for drilling into stainless steel, titanium, cast iron, and other tough materials. Engineered for professionals who demand reliability and efficiency, this bit withstands temperatures up to 1100°F and ensures fast, clean cuts with its spiral flute design.

Specifications

ASIN	B000AEVY24
Brand	BOSCH
Brand Name	BOSCH
Customer Reviews	4.7 out of 5 stars 1,957 Reviews
Cutting Angle String	118 Degrees
Cutting Diameter	0.13 Inches
Cutting angle string	118 Degrees
Cutting diameter	0.13 Inches
Finish Types	Titanium
Finish type	Titanium
Global Trade Identification Number	00000346333473
Included Components	1 Bit
Item Dimensions	4 x 46 x 147 millimeters
Item Type Name	Bosch CO2135 1/8 In. x 2-3/4 In. Cobalt Drill Bit
Item Weight	0.04 Pounds
Manufacturer	Bosch
Material	Cobalt
Material Type	Cobalt
Model	CO2135
Number of Flutes	2
Number of Pieces	1
Part Number	CO2135
Point Style	Split Point
Set Name	Single
Shank Type	3-Flat
Shank type	3-Flat
Surface Recommendation	Metal
Tool Flute Type	Spiral
UPC	000346333473
Unit Count	1 Count

Reviews

P**A

Bosch CO2136 9/64 drill bit

The 5/64, 7/64 and 9/64 inch sizes are basic smaller drill bits. They are ones you are most likely to break in a bit set. So you will likely have to go shopping for replacements for broken bits in these sizes. I recommend the reasonably priced Dewalt DWA1205 and DWA1207 for the first two sizes and the Bosch CO2136 for the 9/64 inch. All are available from Amazon.

2.11.2025

M**E

Delivered on time.

Good quality worked as expected.

25.01.2025

B**A

Replaced a bit I broke in my set

Needed a cobalt bit to replace one I had broke in my set. Price was great.

18.03.2024

V**Y

good

works great on my super hard and 1/4 thick outdoor stainless steel handrail, but it still slips

6.06.2020

S**R

Very Good Drill Bit

I really like this bit. It did the job drilling into metal. Highly recommended.

14.03.2024

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Smooth transaction and product arrived in perfect condition.

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