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 2Pcs 6 Inch Door Bolts - Stainless Steel Concealed Security French Door Locks with Hardwares, Metal Flush Latch Bolts for Composite Wood Double Dummy Door, Black

Sumnacon 2Pcs 6 Inch Door Bolts - Stainless Steel Concealed Security French Door Locks with Hardwares, Metal Flush Latch Bolts for Composite Wood Double Dummy Door, Black

Product ID: 140819298

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Details

Brand
Sumnacon
Mounting Type
Door Mount
Material
Metal Steel
Color
Black
Style
Modern
Product Dimensions
5.91"L x x

🔒6-inch solid stainless steel bolts

⚙️automatic holding spring tension

🛠️includes rust-proof screws & strikes

Description

🔐 Elevate your door game with sleek, stealthy security!

BUILT TO LAST - Crafted from heavy-duty stainless steel for ultimate rust resistance and durability.
DUAL POINT SAFETY - Recommended use on both top and bottom of inactive door leaf for maximum protection.
EFFORTLESS OPERATION - Innovative lever switch with smooth, comfortable touch—no more clunky push-slide hassles.
COMPLETE INSTALLATION KIT - Comes with all necessary rust-proof screws and strikes for a hassle-free setup.
SEAMLESS SECURITY INTEGRATION - Flush-mounted design keeps locks discreet and stylish for modern double doors.

The Sumnacon 2Pcs 6 Inch Door Bolts are premium stainless steel flush bolts designed for composite, French, and double doors. Featuring an automatic holding spring and a smooth lever switch, these black brushed-finish bolts offer concealed, heavy-duty security. Complete with rust-proof screws and strikes, they ensure easy installation and long-lasting protection for your home.

Specifications

Brand	Sumnacon
Mounting Type	Door Mount
Material	Metal, Stainless Steel, Wood
Color	Black
Style	Modern
Product Dimensions	5.91"L x 0.79"W x 0.67"Th
Finish Type	Brushed
Number of Pieces	2
Manufacturer	Sumnacon
Part Number	ULSMC00317
Item Weight	7 ounces
Item model number	ULSMC00317
Is Discontinued By Manufacturer	No
Size	6 Inch
Finish	Brushed
Batteries Included?	No
Batteries Required?	No

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