1、This lock installation kit is suitable for opening holes in wood, plywood, gypsum board, plastic, acrylic board and wood. 2、Specially designed for the hole‑punching of the spherical door lock, this set can solve the problem of punching the spherical door lock! 3、Made of high-quality steel at high temperature, the hardness of the teeth is HRC48-50. 4、The cutter head is of sharpness, tidy, finely polished, and the drilled hole has a good finish. 5、This set contains a drill bit, a flat drill and a hole opener, which is very convenient for novices. Item Type: Lock Installation Kit Material: High carbon steel Uses: Suitable for opening holes in wood, plywood, gypsum board, plastic, acrylic board and wood. Applicable Equipment: Electric drill, bench drill or other platform drilling equipment Hole Opener Outer Diameter: Approx. 54mm / 2.1in (2-1/8in) Flat Drill Specifications: Approx. 22mm / 0.9in (7/8in) Drill Bit Specification: Approx. 6mm / 0.2in Drill Shank Type: Triangle shank 1 x Drill Bit 1 x Flat Drill 1 x Hole Opener