High-quality materials: Made of high-carbon steel and hardened by quenching heat treatment. Unique design: The biggest difference between a three-point wood drill bit and a twist drill bit is that its head has three points, which are easy to locate and do not stray. When cutting at high speed, the wood is powder. Various uses: You can use an auger to drill and cut wood, branches, beams, planks, trunks and other wood materials. Perfectly suited for construction sites, it can be renovated, demolished, torn apart, and much more. Widely Applicable: The HSS auger set is also suitable for plastic, plastic, PVC, silicone, plexiglass, plasterboard, and gypsum for soft materials. Various Sizes: There are 7 sizes (4/5/6/7/8/10/12mm) of extended wood drill bit set to meet your different working needs. ;7-Piece 300mm Extended Three-Point Wood Drill Bit Set Whether it is industrial production or home use, it is a very practical woodworking tool, popular with DIY enthusiasts and carpenters. The extended drill bit / multi-size three-point wood drill bit set Solve the problem of deep woodworking in woodworking. The polished blade reduces friction. The black oxide coating can effectively extend the life of the drill bit. Specifications: Material: Heat-treated high-carbon steel Size: 4 5 6 7 8 10 12 mm Length: 300 mm Delivery list: 1 x 4 mm drill bit 1 x 5 mm drill bit 1 x 6 mm drill bit 1 x 7 mm drill bit 1 x 8 mm drill bit 1 x 10 mm drill bit 1 x 12 mm drill bit