Package Contents: You will receive 8 different sizes of twist drill bits. Drilling Diameter: 10mm/12mm/14mm/16mm/20mm/22mm/25mm/30mm, Total Length: 165mm 4-Flute Design with Sharp Tip: The HSS wood drill bit features a four-flute design with a sharp tip for precise positioning and easy activation of cutting hole points. Quick Change Hexagon: The 1/4" hex shank fits an electric drill and a bench drill, it allows for quick changeover and prevents the bit from slipping. Features: The four HSS cutting spurs are designed for faster chip clearance and cutting. They are made of high-strength carbon steel and undergo multiple hardening processes and treatments for longer service life. Wide range of use: The self-positioning tip provides precise positioning. Suitable for drilling soft and hard woods, MDF, plywood, timber, landscape timber, and for installing PVC pipes or boring tree stumps (not for metal). Drill bit Four Blades for Woodworking Made of high quality alloy, high hardness, durable