Item Type: Drill Material: Cemented Carbide Gross Weight: 300.00g Diameter: 4pcs x Approx. 6mm/0.23in, 2pcs x Approx. 8mm/0.31in, 2pcs x 10mm/0.39in, 2pcs x Approx. 12mm/0.47in Quantity: 10pcs Scope of Application: Steel, Copper, Stainless Steel, Iron, Aluminum, Ceramic Tile, Wood, Plastic, Glass, Concrete, Brick Wall, Cement, etc. 1CARBIDE MATERIAL: The hard alloy drill bit combined with the widening and smooth grooving process drills faster, facilitates chip removal, and greatly improves work efficiency. 2NOT EASY TO SLIP: The shank of the drill bit is cut into a three dimensional triangle, so that the electric drill is clamped more tightly, and it is not easy to slip when drilling, and it is more safe to use. 3MULTI FUNCTION DRILL: The triangular shank multi function drill can easily penetrate various materials, easy to locate, stable drilling, fast speed, no boundary damage, and neat opening. 4STABLE FUNCTION: The triangular shank multi function drill has low cutting resistance and stable function. Smooth, no folds, no chattering, easy chip cutting. 5DURABLE: The triangular shank multi function drill bit has exquisite workmanship, small size, light weight and practicality, portable and light, without burden.10 x Drill Bit