DIMENSIONS - Our Door Lock Hole Opener Kit is designed for installing hotel doors, security doors and door lock modifying. Includes a metal bracket, a drilling rig, three tool heads, wrenches, rulers, woodworking chisel((NOT USED, BUT POLISHED) and some accessories (A large toolbox is included).★Delivery faster than other similar products. APPLICATION - It can be used for opening new lock hole, opening eccentric lock hole, changing password lock and changing fingerprint lock. The operational safety, Quick slot, Complete specifications, The operation is simple.★If you have any questions about the products, please contact us through the order number 3 CUTTERS - 3 cutters made of tungsten steel, higher quality over high-speed steel. Sizes: 18/22/24 mm (0.7/0.87/0.95 inch). Bigger M10 series with no distortion.★Now we have separate Cutter Bit for sale(It's at the bottom of the product description) EASY OPERATION & CARRY - Applying vertical guides with height and depth stops, overrun cutting area will be avoided by using this tool set. Gross weight: 11 lb (5 kg). COMPREHENSIVE UPGRADE - The drilling machine adopts split type, easy to install and disassemble, industrial-grade linear bearing and precise scale, which can improve the cutting precision and speed and work efficiency.★If you are using it for the first time, it is recommended to make a use cut on other discarded boards of equal thickness to avoid damaging your new wooden door