Discover the ultimate hinge adjustment tool for your commercial doors This double - head wrench is made of high - quality heavy steel, ensuring a sturdy and durable construction. With a welded integral steel structure, it can handle regular use without damage. The tool comes in size combinations of 14 mm and 18 mm, 23 mm and 25 mm, fitting knuckles of various flag hinge doors on fire, cleanroom, and security doors. To use, simply place the wrench on the hinge and turn it left or right to adjust the hinge gap, quickly solving issues like sagging, sticking, or misaligned doors. Its ergonomic grip allows for easy operation even in tight spaces, and its portable size means you can carry it anywhere. This tool is not for house interior and exterior hinges, but it's a great choice for commercial settings, saving you time and money by avoiding unnecessary hinge replacements and ensuring your doors function optimally.