What You Get - 7 Pieces Concrete Drill Bit in different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Carbide Cross Tip: Tungsten Carbide 4-edged cross tipped with higher hardness, easy to position and improves the drilling speed. Widened Spiral Chip Flute - Improves the chip discharge speed during high-speed operation to prevent clogging, ensure high work efficiency. Anti-slip 1/4'' Hex Shank - Compatible with general electric drills and hand drills, bench drills, can be locked into the quick-change chuck easily and securely. Wide Application - Can be used for drilling glass, ceramic, tile, cement wall, brick wall, bubble brick, marble, plastic, wood, soft metal, thin iron plate, aluminum alloy, etc. Please Note - Please try to keep drilling vertically, and keep bits cool with water or coolant when drilling hard material(glass, porcelain floor tile, marble, or granite). Specification: color: as show Material: Tungsten Carbide Shank Type: Hexagon Shank Shank Diameter: 6.35mm/ 1/4'' Tip Type: Four-edged Cross Tip Tip Diameter: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Working Length: 35mm, 40mm, 48mm, 53mm, 58mm, 76mm, 78mm Overall Length: 82mm, 88mm, 94mm, 99mm, 104mm, 116mm, 124mm Package Included: 7 x Masonry Drill Bits