Description: High quality - Made of high quality tungsten carbide, with a strengthened head, high hardness, not easy to break and bend, surface rust treatment, long service life. Multi-grind bit head - Multi-grind sharp edges deliver high drilling speed even in hard materials, perform 85% faster than standard bits, U-shape groove provide good chip removal. Triangle shank - The triangle design of shank helps the hand electric drill to clamp the drill bit, prevent slipping and wandering, fit for most hand electric drills. Widely Used - Great for most materials in interior fitting work, metal, glass, ceramic tiles, wood, ceramics, stone, concrete, bricks, etc. (When drilling hard material, please use water for lubrication) Specifications: Material: High Speed Steel (HSS) + Alloy Color: Multi-colored Net Weight: 0.15kg/ 0.33 lbs Product Size - 3mm, 4mm, 5mm, 6mm, 8mm, 10mm,12mm Package Size: 20x12x2cm/ 7.9x4.7x0.8 inch Package Weight: 0.2kg/ 0.44 lbs Package Included: 7 x Drill Bits Set Note- - Please refer to the measurement. Tiny measuring error is allowable in normal range. - There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item.