Door lock kit utilizes C-clamp design with tool-free clamping and no surface damage Door lock kit utilizes alignment window and taller bushings to deliver accurate height placement and straight drilling Door lock kit includes two adjustable bushings which accept both standard backsets and both common door thicknesses Designed to fit the most common lock sizes in use today Works well with metal or wood doors Includes hole saw consisting of durable M3 steel Also includes backing plates reinforced to counteract warping Backing plates also aid in easy disassembly from the mandrel Product Description Compact injection molded hole saw kit box with carrying handle. Three trade specific configurations contain the most commonly used sizes. Utilises C-clamp design with tool free clamping and no surface damage, compatibility for the two most common backsets and door thicknesses. Includes: 1", 2-1/8", mandrel, adapter, drill guide, replacement parts (including two additional pilot point centering bits), two adjustable bushings which accept both standard backsets and both common door thicknesses, and new quick change mandrel for increased user productivity. Make replacing your locks a breeze with the DEWALT D180004 Bi-Metal Door Lock Installation Kit. This door lock installation kit is designed to fit the most common lock sizes in use today. It?s crafted to work with either metal or wood doors and includes hole saw consisting of durable M3 steel. It also includes backing plates that are reinforced to counteract warping and aid in easy disassembly from the mandrel. From the Manufacturer DEWALT D180004 Bi-Metal Door Lock Installation Kit