1[Auger Drill Bit Set] This auger drill bit set includes six sizes: 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, and 1 1/8 inch, suitable for various woodworking needs and projects. 2[High Efficiency] Four flutes and four slots design, CNC machined flutes are sharper, making it easier to penetrate various wooden boards, ensuring higher work efficiency. 3[Accurate Positioning] The tip of auger bit is designed with right hand spiral self tapping thread, providing enhanced accuracy in positioning for your drilling projects. 4[Fast Chip Removal] With spiral slot, the wood drill bit ensures fast chip removal during high speed rotation, maximizing your drilling efficiency. 5[Carbon Steel Construction] Made of high strength carbon steel, after hardening and tempering treatment, these drill bits have longer service life, meeting your needs in daily use. Item Type: Auger Drill Bit Set Material: High carbon steel Specifications: 1/2in, 5/8in, 3/4in, 7/8in, 1in, 1-1/8in Features: Accurate positioning, deep hole drilling Compatible Devices: Hand electric drill, lithium drill, bench drill Suitable Materials: Suitable for various softwood, hardwood, plastic, rubber,and other materials 6 x Auger Drill Bits