High Quality Material - These drill bits are made of carbon steel (65#), which is rust-resistant and durable. They can be used to process all kinds of cork, hardwood and plastic materials. They are practical drilling tools for DIY enthusiasts and woodworking enthusiasts. 6 Sizes to Meet Your Different Needs - Auger drill bits come in 6 different diameters, including 6mm, 8mm, 10mm, 12mm, 14mm and 16mm. You can choose the suitable drill bit according to your needs while working. Hex Shank Design - This design prevents the hex shank from slipping while working, and the hex shank can be used with shank drills and drill presses Self-aligning threaded head - The self-aligning threaded head of the auger drill bits can help the drill bit to be placed on the wood precisely and quickly to make drilling easier. The solid core design makes the drill bit stable and durable when drilling, and the wide blade ensures faster drilling, a smooth hole wall after drilling and smooth chip removal