This frame drill bit is designed to create a precise and clean pilot hole in door or window frames for installing frame screws. The 13 mm diameter and 100 mm total length provide ideal dimensions for most common installations, ensuring the screw seats firmly and accurately without risking frame material splitting. The adjustable 5 mm center drill ensures accurate guidance and stable drilling even in more challenging angles. The high-quality HSS material guarantees excellent durability and long-lasting performance, even under repeated use and in tougher materials. This frame drill bit is a reliable and efficient choice for anyone who wants to speed up work and ensure a professional result in every frame installation.