Can this be installed in the active door of a steel french door?

Yes, that's how I installed mine.

How does one even install these?

I made a jig with plywood, then pin-nailed it to the doors edge. Set the depth and go at it. Last, clean up the corners with a chisel. Now you’re ready to install the locking mechanism.

Is this marine grade stainless steel for use on the coast?

Cheap Chinese stainless steel. But for the price it should work

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Sumnacon 2 Pcs Door Flush Bolts 6 Inch Flush Bolt for Double Door,Silver

Sumnacon 2 Pcs Door Flush Bolts 6 Inch Flush Bolt for Double Door,Silver

Product ID: 50952204

Details

Brand
Sumnacon
Lock Type
Flush Bolt
Material
Stainless
Recommended Uses For Product
Securing doors
Special Feature
Automatic

🔒6-inch solid stainless steel strength

⚙️Automatic holding spring tension

🛠️Easy lever switch, tool-free feel

₨448

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Elevate your door security with sleek, silent strength!

PRECISION FIT - 6-inch flush bolt perfectly sized for double, French, patio, and composite doors—top and bottom installation recommended.
HASSLE FREE SETUP - Includes rust-proof screws and strikes with clear instructions for quick, stable installation.
EFFORTLESS CONTROL - Innovative lever switch design replaces clunky sliders for smooth, comfortable locking and unlocking.
ROCK SOLID SECURITY - Crafted from corrosion-resistant stainless steel for heavy-duty durability and rustproof reliability.
INVISIBLE PROTECTION - Sleek, concealed design blends seamlessly with modern décor while securing inactive door leaves.

The Sumnacon 2 Pcs 6 Inch Door Flush Bolts are precision-engineered stainless steel locks designed for double and composite doors. Featuring an automatic holding spring and an ergonomic lever switch, these flush bolts offer robust, rustproof security with a modern, concealed aesthetic. Easy to install with included hardware, they provide reliable top-and-bottom locking for enhanced home safety and style.

Specifications

ASIN	B0773K3SX7
Additional Features	Automatic Holding Spring, Easy-to-Use Switch Design
Best Sellers Rank	#37,464 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #90 in Door Latches & Bolts
Brand Name	Sumnacon
Color	Silver
Customer Reviews	4.5 4.5 out of 5 stars (1,360)
Finish Types	Brushed
Included Components	screws, strikes, installation instructions
Item Highlight	Concealed Security Door Locks for French Doors,Composite ,Wood ,Double ,Dummy Doors,Brush Stainless Steel Finish
Item Weight	0.22 kg
Lock Type	Flush Bolt
Manufacturer	Sumnacon
Manufacturer Part Number	ULSMC01023
Material Type	Stainless Steel
Model Number	ULSMC01023
Number of Items	2
Number of Packs	2
Number of Pieces	2
Recommended Uses For Product	Securing residential doors (French, patio, wood, double, composite, dummy)
Style Name	modern
UPC	736140224302
Unit Count	2 Count

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