Forstner Bit: Drilling diameter: 38 mm / 1.5"; Shank size: 9 mm / 0.35"; Drilling depth: 50 mm / 1.97"; Overall length: 80 mm / 3.15". Thickened carbide cutter and solid hardened steel body, round shank Forstner bits for woodworking. Applications: Can be used for drilling holes in wood and plastic products, furniture, and door hinges. For cutting wood, plywood, solid wood boards, MDF, plastics, fiberglass, etc. The Forstner bit is intended for general use. Features: Tungsten carbide cutting tip with special heat treatment for a sharp edge, high hardness, no burrs, and long-lasting use. Curved, arc-shaped head design for easy chip removal and more efficient drilling. How to use: Suitable for bench drills, vertical drills, and CNC cutting machines. For hardwoods or other hard materials, inject water to improve quality. and drilling accuracy and extend the life of the hole opener. Tips: Maximum speed: 2000 rpm. For use on office (fixed) equipment and CANNOT be used on portable power