Size - Drilling diameter: 20mm; Shank size: 17mm; ; Total Length: 129mm / 5"; Shank Type: Hex Shank. Material - The wood drilling tool is made of tungsten carbide, which has high strength, hardness, wear resistance and heat resistance. The painted surface can improve rust and corrosion resistance. The heat-treated bit is durable, sharper and can dig neat, smooth and burr-free holes. Features - The lug design ensures that the bit accurately penetrates the wood, effectively prevents slippage and accurately locates the drilling hole, thereby improving the accuracy of the operation. The three-tooth arc curve design on the head reduces cutting resistance and debris faster, thus achieving higher work efficiency. Applications - Suitable for opening holes in solid wood, cork, hardwood, plywood, medium density fiberboard, board, etc. particles, as well as plastics, rubber and other materials. Drill bits can be used with handheld drills, drill presses, drill presses, vertical drills, CNC engraving machines, etc.. Notes - Woodworking bits cannot be used for metalworking. The material must be fixed when cutting, and the bit must be perpendicular to the material. When working hardwood, water, oil or lubricant can be used to improve the accuracy and quality of drilling..