Combination: 1mm*10, 1.5mm*10, 2mm*10, 2.5mm*10, 3mm*10, 3.5mm*10, 6 sizes total 60 twist drill bits, comes with a storage box to meet your daily needs. Material: These bits are made of high speed steel (HSS), which is harder, sharper and more heat-resistant than ordinary bits; the surface is coated with titanium, which reduces the friction and wear on the bit, speeds up drilling and extends its service life. Performance: The 135° angle of the drill tip eliminates the need for a pilot hole and keeps the drill always centred, and the double U-shape design makes chip evacuation easier and increases the efficiency of use. Widely Used: It is the best choice for home, general construction and engineering use. The drill kit has good material toughness, wear resistance and drilling ability for wood, plastic, soft metal, steel, aluminium alloy and other soft metals. Warm Tip: If you receive a defective product or have any problems about item, please contact us, we will help you as soon as possible. Material:high speed steel (HSS).Attention: 1. please keep them away from little kids; 2. If you receive a defective product or have any problems about item, Please contact us and we will assist you as soon as possible.