•About this item【High-quality & Durable Material】35mm concealed hinge jig is made of high quality aluminum alloy, precision manufacturing, sharp drill bit, wear-resistant and durable, anti-corrosion and rust-proof, can be used for many years.【Quick Fix & Release Handle】Punch Positioner has an adjustable platen and a quick-fix clip where boards can be quickly positioned and tightened——no movement enables more solid drilling. Fixing or releasing just in one handle, no pliers needed.【Adjustable Drilling Depth】Adjust the distance between the limit ring and the drill sleeve to determine the depth of the hole.This concealed hinge jig is suitable for boards with a thickness of 15mm to 25mm, adjust the drilling depth to 12-13mm normally.