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 | Concealed Security Door Locks for French Doors,Composite ,Wood ,Double ,Dummy Doors,Brush Stainless Steel Finish

Sumnacon 2 Pcs Door Flush Bolts 6 Inch Flush Bolt for Double Door,Silver | Concealed Security Door Locks for French Doors,Composite ,Wood ,Double ,Dummy Doors,Brush Stainless Steel Finish

Product ID: 50952204

Details

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

🔒6-inch flush bolt length

⚙️Automatic holding spring

🛠️Solid stainless steel build

€ 36.37

Duties & taxes included

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Elevate your door security with sleek, silent strength!

BUILT TO LAST - Crafted from heavy-duty 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 without the push-slide hassle.
VERSATILE COMPATIBILITY - Ideal for French, composite, wood, patio, double, and dummy doors—perfect for securing your home’s most stylish entrances.
COMPLETE INSTALLATION KIT - Includes rust-proof screws and strikes with clear instructions for quick, professional-grade setup.
SEAMLESS SECURITY INTEGRATION - Concealed flush bolt design blends perfectly with modern doors for a sleek, unobtrusive look.

The Sumnacon 2 Pcs 6-Inch Flush Bolts provide a robust, concealed locking solution for double and dummy doors. Made from solid stainless steel with a brushed silver finish, these bolts feature an automatic holding spring and ergonomic lever switch for smooth, reliable operation. Designed for easy installation on French, composite, wood, and patio doors, they enhance home security while complementing modern decor.

Specifications

ASIN	B0773K3SX7
Additional Features	Automatic Holding Spring, Easy-to-Use Switch Design
Best Sellers Rank	#36,864 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 (1,350)
Finish Types	Brushed
Included Components	screws, strikes, installation instructions
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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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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€ 36.37

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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