[5 SIZE DRILLS FOR DIFFERENT NEEDS]: There are 7 pieces extra long drill bits with 7 different sizes (6 8 10 12 14 mm), the total length is 230 mm and you can choose bits in different sizes to drill different holes as you like. High-quality material: these carbon steel twist drills are durable, have high abrasion resistance and a long service life, and form cleanly straight, smooth holes in hardwood or cork. [Strong stability]: The fixed center of the solid and wide blade twist drill center makes the drill bit stable and robust during the drilling process. The wide blade provides faster drilling, easier chipping and smoother perforated walls. Easy to use: the automatic thread head at the front end of the auger drill helps to position the drill accurately and quickly on the wood for easy drilling. The special design makes the cylindrical handle suitable for operation and comfortable. [EXQUISITE CRAFT]: Twist drill bits are shaped after quenching and meet the industrial tolerance