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

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 flush bolt

⚙️Automatic holding spring for secure tension

🛠️Includes rust-proof screws & strikes for easy install

€ 32.89

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Elevate your door’s security with sleek, silent strength!

DUAL POINT SAFETY - Recommended installation top and bottom of inactive door leaf for maximum stability.
HASSLE FREE SETUP - Comes with all screws, strikes, and clear instructions for a quick DIY upgrade.
ROCK SOLID SECURITY - Machined from heavy-duty stainless steel for ultimate rustproof durability.
EFFORTLESS OPERATION - Innovative lever switch design replaces clunky push-slide bolts for smooth, satisfying use.
INVISIBLE PROTECTION - Flush-mounted design keeps your door sleek and modern while locking tight.

The Sumnacon 2 Pcs 6 Inch Door Flush Bolts are precision-engineered stainless steel locks designed for double, French, patio, composite, and wood doors. Featuring an automatic holding spring and a smooth lever switch, these flush bolts provide concealed, heavy-duty security while complementing modern decor. Easy to install with included rust-proof screws and strikes, they ensure reliable, dual-point locking on inactive door leaves for enhanced home safety.

Specifications

ASIN	B0773K3SX7
Additional Features	Automatic Holding Spring, Easy-to-Use Switch Design
Best Sellers Rank	#28,502 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #65 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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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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TrustScore 4.5 | 7,300+ reviews

Vikram D.

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

2 weeks ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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€ 32.89

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

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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