Forstner Bit: Drilling Diameter: 26mm / 1.02"; Shank Size: 8mm / 0.31"; Drilling Depth: 48mm / 1.89"; Total Length: 80mm / 3.15". Thickened carbide cutter and solid hardened steel body, round shank Forstner bits for woodworking. Applications: Can be used for drilling holes on wood and plastic products, furniture, door hinges. Used for cutting wood, plywood, solid wood boards, MDF, plastics, fiberglass, etc. The Forstner drill bit is for ordinary use Features: Tungsten carbide cutting tip with special heat treatment for sharp cutting edge, high hardness, no burrs and durable use. Arc curved design head for easy chip removal and more efficient perforation. How to use: Suitable for bench drill, vertical drill, CNC carving machine. Processing hardwood or other hard materials should be injected with water to improve the drilling quality and accuracy and extend the life of the hole opener. Tips: Maximum speed: 2000 rpm. Used on desktop (stationary) equipment and can NOT be used on handheld