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 Bolt - 6 Inch Concealed Security Door Lock for French Doors,Composite Doors,Wood Doors,Double Doors,Dummy Doors,Brush Stainless Steel Finish

Sumnacon 2 Pcs Door Flush Bolt - 6 Inch Concealed Security Door Lock for French Doors,Composite Doors,Wood Doors,Double Doors,Dummy Doors,Brush Stainless Steel Finish

Product ID: 271452676

Details

Brand
Sumnacon
Lock type
Flush Bolt
Material
Stainless
Recommended uses for product
Securing doors
Special features
Automatic

🔒6-inch flush bolt length

⚙️Automatic holding spring

🛠️Solid stainless steel build

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Description

🔐 Elevate your door security with sleek, silent strength!

BUILT TO LAST - Crafted from heavy-duty brushed stainless steel, ensuring rustproof, corrosion-resistant durability for years of reliable use.
EFFORTLESS OPERATION - Innovative lever switch with automatic holding spring offers smooth, tensioned locking and unlocking without the hassle.
VERSATILE COMPATIBILITY - Perfectly engineered for French, composite, wood, double, patio, and dummy doors—upgrade your home’s security effortlessly.
HASSLE FREE INSTALLATION - Includes rust-proof screws and surface strikes with clear instructions, making professional-grade security accessible to every DIYer.
SEAMLESS SECURITY INTEGRATION - Concealed flush bolt design blends perfectly with modern doors for a sleek, unobtrusive look.

The Sumnacon 2 Pcs Door Flush Bolt is a 6-inch brushed stainless steel concealed lock designed for enhanced security on French, composite, wood, double, patio, and dummy doors. Featuring an automatic holding spring and a smooth lever switch, it offers durable, rustproof protection with easy installation using included hardware. Ideal for modern homes seeking discreet yet robust door security.

Specifications

ASIN	B0773K3SX7
ASIN	B0773K3SX7
Additional Features	Automatic Holding Spring, Easy-to-Use Switch Design
Best Sellers Rank	#3,499 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #9 in Door Latches & Bolts
Brand Name	Sumnacon
Color	Silver
Customer Reviews	4.5 4.5 out of 5 stars (1,242)
Customer reviews	4.5 4.5 out of 5 stars (1,242)
Date First Available	26 December 2017
Finish Types	Brushed
Included Components	screws, strikes, installation instructions
Is Discontinued By Manufacturer	No
Item Weight	0.22 Kilograms
Item model number	ULSMC01023
Lock Type	Flush Bolt
Manufacturer	Sumnacon
Manufacturer	Sumnacon
Manufacturer Part Number	ULSMC01023
Material Type	Stainless Steel
Model Number	ULSMC01023
Number of Pieces	2
Package Dimensions	16 x 3.81 x 2.59 cm; 220 g
Recommended Uses For Product	Securing residential doors (French, patio, wood, double, composite, dummy)
Smart Home Compatibility	Not Smart Home Compatible
Style Name	modern
UPC	736140224302
Unit Count	2.0 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₨3421

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In stock

Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Sri Lanka.

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TrustScore 4.5 | 7,300+ reviews

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