Innovative Products for the Lock, Security & Maintenance Industries. GKL Products has been developing both residential and commercial products for the lock and security industry since 1972. Our flagship product, the Hinge Doctor®, has been an effective and unique tool in the restoration of door hinges.
We manufacture our products from the best materials available and with the highest quality craftsmanship. A purchase of a quality GKL Product is a choice for durability and value, which will pay off over time, every time.
HINGE DOCTOR® PRODUCTS
Repair sagging doors in 15 seconds
HINGE SCREW PRODUCTS
Special hinge screws for stripped out frames
STOREFRONT DOOR PRODUCTS
Repair or modify storefront doors with a twist
MORE INNOVATIVE PRODUCTS
Designed to save you time and money
"If you’re in the aluminum stile door repair business you need this product!"
– Jake Jakubuwski
The National Locksmith magazine
“I used to remove the hinges from the door and put them in a vise to bend them back to their original condition. Now I use the Hinge Doctor and what used to take up to an hour takes only a few seconds. Thanks for a great tool.”
– Eric Olsen
"I am an institutional lock smith and purchased a mega screw driver a few years ago and quickly realized the benefits. It has made my job much easier. I honestly don’t know how I would get a long without it."
– Paul Dudley