Feature:1. With arc design of the cutter head, the cutting resistance is small, and the hole opening efficiency is improved.2. The drill bit is designed with easy chip removal, less dust and chip removal during cutting operations.3. High speed steel alloy cutter head makes the drill bit durable with fast drilling speed.4. Excellent triangular blade angle design makes it easy to position and drill for the drill bit.5. The drill bit is mainly used for perforating wood products, installing spherical door locks, drawer locks, hinge openings, desk openings, etc.How to Use:1. Mainly used for perforating wood products, installing spherical door locks, drawer locks, hinge openings, desk openings, etc., pay attention to safety when using.2. The recommended wire hole of the desk is 53mm, the hinge hole of the door lock is 35mm, the old 2 door lock is 28mm, and the drawer lock hole is 16mm. The above data is for reference only.3. After each use, please wipe clean the stains on the surface of the product, to prevent rust from rust.4. Various hand tools must be installed according to the correct steps, do not use the tools before they are installed.Specification:Item Type: Wood Hole Opener Drill BitMaterial: High-speed steel alloyHole Diameter: Approx. 40mm / 1.6inTotal Length: Approx. 80mm / 3.1inWork