Feature:1. Spiral chip flute, highspeed operation and fast chip removal, can improve efficiency.2. Triangular drill shank is suitable for a variety of electric drill chucks, which can be used for hand electric drills, impact drills, bench drills, etc.3. The drill bit has sharping cutting, with high smoothness and fast working speed.4. The drill diameter is 12mm, the total length is 123mm and the hole depth is 73mm.5. Small size, easy to carry and store, convenient to use and with good performance.Specification:Item Type: Multifunctional Drill BitsMaterial: CarbideDrill Diameter: Approx. 12mm / 0.5inTotal Length: Approx. 123mm / 4.8inHole Depth: Approx. 73mm / 2.9inShank Diameter: Approx. 8mm / 0.3inDrill Shank Type: Triangle drill shankCan Directly Dry Drilling Materials: Wall, wood, aluminum, copperNeed Add Water Side Drill Materials: Steel, stainless steel, concrete, glass tiles, red bricks, marble, glazed tiles, bubble tiles, granite..Package List:5 x Drill Bits