HIGH QUALITY MATERIALwhich quickly and cleanly forms smooth, straight holes in hardwood or cork. 6 SIZESThere are 6 different diameters of auger drill bits, including 6mm, 8mm, 10mm, 12mm, 14mm,16mm, total length: 230mm/9.05'', to meet your various needs. HEX SHANK DESIGNThe unique design allows the hex shank to not slip during operation, and the hex shank can be used with hand drills and drill presses. SELF-DIRECTION THREAD HEADThe automatic threaded head on the front of the drill bit allows the drill bit to be accurately and quickly positioned on the wood for easy drilling. Wide and large blade center twist drill bit. The solid center design makes the drill bit stable and sturdy during the drilling process. The wide blade allows for faster drilling, makes chipping easier and smooths the hole walls. DIY ACCESSORY High quality carbon steel auger tips are rust resistant and durable.