Adjustable Lock Arm for Precise Drilling: Adjustable latch installation tool facilitates precise drilling and features a snap lock arm for selecting door widths and backrests . Drill one side of the door panel vertically about halfway down , then drill the other side of the door panel until it penetrates Premium Impact Resistant Blade: Manufactured from premium impact resistant materials , the blades are extremely hard and abrasion resistant and can withstand repeated cuts without deforming or dulling . Ensure consistent depth of cut every time for a seamless fit installation of the door lock plate Precision Heat Treated Edge: The blade is built with a special heat treatment process for pointed edges and precise cutting , suitable for a wide range of softwood and hardwood materials . Good durability , even after a long time of use can still maintain excellent cutting performance , reduce the trouble of frequent blade replacement Ergonomic Non Slip Handle: The handle is ergonomically designed for a natural and comfortable grip , effectively reducing hand fatigue . Anti slip texture on the surface ensures that the blade does not slip when exerting force , enhancing operational safety Wide Compatibility: The product is suitable for the most common lock sizes in daily use of wooden doors . Adjustable latch installation tool for 1 3/8 inch , 1 1/2 inch and 1 3/4 inch thick doors , as well as 2 3/8 inch and 2 3/4 inch thick standard door panels , to meet the majority of residential and commercial door locks installation needs, Manufacturer: Sutowe