HIGH QUALITY MATRIX: Quick and clean smooth, straight holes in hardwood or cork 7 SIZES: There are 7 different diameters of auger drill bits including 6mm/8mm/10mm/12mm/14mm/16mm/18mm; total length: 230mm / 9.05 '', to meet your various needs SDS: The unique design ensures that the shank will not slip during operation, and the SDS shank can be used with hand drills and drill presses SELF-DIRECTED WIRE HEAD: The automatic threaded head at the front of the bit allows the bit to be positioned accurately and quickly on wood to facilitate drilling; Large and wide blade central helical drill; The solid center design makes the drill bit stable and sturdy during the drilling process; The wide blade allows for faster drilling,facilitates scaling and softens hole walls DIY ACCESSORY: High quality carbon steel auger tips are rust resistant and durable