[Radian Cutter] Smooth chip removal and efficient work with radian curved design. [Specific Design] Greater efficiency and precise positioning with the 3-tooth cutter head. Punching is more efficient. [Material] The drill bit is made of 45# steel and carbide alloy, sharper and more durable, high hardness, wear resistance, good toughness, heat and corrosion. [Widely Application] For perforating wooden products, such as installing ball-shaped door latches, drawer locks, etc. Tips: Maximum speed: 2000RPM. Used on office (stationary) equipment and cannot be used on hand-held power tools (such as a hand drill or electric drill). Cannot drill metal and non-ferrous metal. To avoid causing damage, make sure there are no nails or other metal objects in the wood before drilling. The cutting edge and tip of the opener should be sharpened in time.