6 SIZES FOR YOUR DIFFERENT NEEDS There are 6 different diameters of auger drill bits, including 6mm, 8mm, 10mm, 12mm, 14mm, 16mm. So you can choose the most suitable wood auger drill for woodworking. Threaded Tip & Central Solid Design The drill bit is 230mm long. The threaded tip blade and central solid design can provide faster drilling, easier chip removal and smoother hole walls. And also makes the drill stable and strong when drilling. HIGH QUALITY AUGER DRILL BIT SET Made of 65# high carbon steel and the auger bits are rust proof and durable. Suitable for drilling cork, soft and hardwood, MDF, plywood, wood, railway bindings, landscape wood, invisible floating shelf bracket, tree stump, plastic and aluminum alloy, quickly create deep and clean holes. SELF-ALIGNING THREAD HEAD The head of auger drill bits helps accurately adjust the drill position on the wood for easy drilling. Flat perforated wall after drilling and smooth removal of chips. HEX SHANK DESIGN This design will not let the hex shank slip while working, and the hex shank can be used with lithium drills, hand drills and bench drills.