1Pcs Multifunctional Drill Bits Twists Drillhead Wall Ceramic Glass Punching Hole Working Tool 4 Optional Gold 6mm Features: Reinforced alloyhead with high hardness, prevents bit cracking, help improving work efficiency. The triangular shank design makes the clamping more tight and does not slip. U-shaped spiral grooves design provides low resistance, resulting in smoother and faster drilling and easier chip removal. Strong toughness and wear resistance, can be installed in the hand drill, electric drill, benchdrill. Smooth, accurate and easy drilling in ceramic tile, , brick wall, wood and so on. 4 specifications optional: 6mm, 8mm, 10mm, 12mm, you can choose according to your demands. Specifications: Name: Multifunctional Drill Bit Kit Material: alloy Color: blue, orange, gold (optional) Type: 6mm, 8mm, 10mm, 12mm (optional) 6mm size: Total length: 100mm / 3.94in Working depth: 50mm / 1.97in Drill diameter: 6mm / 0.24in Handle diameter: 4mm / 0.16in 8mm size: Total length: 115mm / 4.53in Working depth: 70mm / 2.76in Drill diameter: 8mm / 0.31in Handle diameter: 6mm / 0.24in 10mm size: Total length: 120mm / 4.72in Working depth: 75mm / 2.95in Drill diameter: 10mm / 0.39in Handle diameter: 7mm / 0.28in 12mm size: Total length: 120mm / 4.72in Working depth: 75mm / 2.95in Drill diameter: 12mm / 0.47in Handle diameter: 9mm / 0.35in Packing size: 150 * 100 * 100mm / 5.91 * 3.94 * 3.94in Packing weight: 6mm: 10g / 0.35ounce 8mm: 12g / 0.42ounce 10mm: 14g / 0.49ounce 12mm: 16g / 0.56ounce Packing List: 1 * Drill Bit