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,Black

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

Product ID: 140819298

Details

Brand
Sumnacon
Lock Type
latch_lock
Material
Metal Steel
Recommended Uses For Product
Residential
Special Feature
Automatic

🔩6-inch solid stainless steel build

🖤Sleek black brushed finish with concealed lever

⚙️Automatic holding spring for secure tension

R732

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Description

🔐 Lock in style and security—because your doors deserve the best.

DUAL POINT SAFETY - Use two bolts top and bottom for maximum stability and peace of mind on inactive door leaves.
EFFORTLESS CONTROL - Integrated lever switch design offers smooth, comfortable operation—no more fumbling with push-slide bolts.
INVISIBLE ELEGANCE - Concealed flush mount blends seamlessly with modern décor, elevating your door’s style while locking it down.
ROCK SOLID SECURITY - Heavy-duty stainless steel construction ensures rustproof, long-lasting protection for your double doors.
HASSLE FREE INSTALLATION - Comes with rust-proof screws, strikes, and clear instructions—get professional-grade security without the pro price.

The Sumnacon 2 Pcs 6 Inch Door Flush Bolts are precision-machined from solid stainless steel with a sleek black brushed finish, designed to secure inactive leaves of double doors including French, patio, and composite types. Featuring an automatic holding spring and an integrated lever switch, these flush bolts provide smooth, reliable locking with a concealed, modern aesthetic. Easy to install with included rust-proof screws and strikes, they offer enhanced stability and durability for residential security needs.

Specifications

ASIN	B07Q349BFJ
Additional Features	Automatic Holding Spring, Integrated Switch Design, Concealed Style
Best Sellers Rank	#33,008 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #83 in Door Latches & Bolts
Brand Name	Sumnacon
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (1,357)
Finish Types	Brushed
Included Components	Screws, Strikes, Installation Instructions
Lock Type	latch_lock
Manufacturer	Sumnacon
Manufacturer Part Number	ULSMC00317
Material Type	Metal, Stainless Steel, Wood
Model Number	ULSMC00317
Number of Items	2
Number of Pieces	2
Recommended Uses For Product	Residential Doors
Style Name	Modern
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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R732

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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The delivery time was excellent, and the packaging was secure.

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