Description: Made of high quality material, durable and practical to use High precision, easy positioning can increased opening speed Triangular shank design for tighter clamping without slipping Suitable for glass, ceramic tile, wood, ceramic, stone, concrete, brick, etc Spiral groove design, effective chip removal, smooth and flat, drilling more smoothly Specification: Material: Alloy Color: Silver & Orange (As Pictures Show) Size: 6mm/8mm/10mm/12mm Drilling Diameter 6mm / 0.23in, Overall Length: 100mm / 3.93in , Working Length: 53mm / 2.08in, Shank Diameter: 4.5mm / 0.17in Drilling Diameter 8mm / 0.31in, Overall Length: 112mm / 4.40in, Working Length: 65mm / 2.55in, Shank Diameter: 6mm / 0.23in Drilling Diameter 10mm / 0.39in, Overall Length: 117mm / 4.60in, Working Length: 70mm / 2.75in, Shank Diameter: 7.5mm / 0.29in Drilling Diameter 12mm / 0.47in, Overall Length: 121mm / 4.76in, Working Length: 70mm / 2.75in, Shank Diameter: 9mm / 0.35in Package Includes: 1 x Drill Bit(2 Pack) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size.