This frame drill bit is designed to make a precise and clean pre-installation hole for door or window frames for the installation of frame screws. The bit’s 13 mm diameter and 100 mm total length provide ideal dimensions for the most common frame installations, allowing the screw to fit tightly and correctly aligned without the risk of cracking the frame material. The adjustable 5 mm center drill ensures accurate guidance and keeps drilling stable even in more demanding positions. High-quality HSS material guarantees excellent durability and long-lasting performance, even with repeated use and in harder materials. This frame drill bit is a reliable and efficient choice for anyone who wants to speed up work and ensure a professional-quality result in every frame installation.