Description:Designed with hex shank that allows the electric drill to securely grip the drill bit, it prevent slippage during working.Adopting U-shaped chip groove, the drill bit has quick chip removal speed, which greatly improves work efficiency.Using high-quality hard alloy material, the drill bits are rust-proof, durable and have high hardness.There are 7 specifications (3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm) for you to choose from.The drill bits can be installed in electric hand drill, bench drill, impact drill to easily drill glass, ceramic tile, wood, stone, concrete, brick and other materials.Item Name: Drill BitsMaterial: Hard AlloyColor: Black Shank Type: Hex ShankSpecifications: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mmFeatures: High Hardness, Wide Applications, Long Life SpanSize Details: 3mm: Total Length: 98mm/3.86", Drill Diameter: 3mm/0.12", Working Length: 42mm/1.65" (Approx.)4mm: Total Length: 98mm/3.86", Drill Diameter: 4mm/0.16", Working Length: 42mm/1.65" (Approx.)5mm: Total Length: 98mm/3.86", Drill Diameter: 5mm/0.2", Working Length: 55mm/2.17" (Approx.)6mm: Total Length: 100mm/3.94", Drill Diameter: 6mm/0.24", Working Length: 55mm/2.17" (Approx.)8mm: Total Length: 117mm/4.61", Drill Diameter: 8mm/0.31", Working Length: 55mm/2.17" (Approx.)10mm: Total Length: 118mm/4.65", Drill Diameter: 10mm/0.39", Working Length: 75mm/2.95" (Approx.)12mm: Total Length: 120mm/4.72", Drill Diameter: 12mm/0.47", Working Length: 75mm/2.95" (Approx.)Shank Diameter: 6.35mm/0.25" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:3mm: 10 x 3mm Drill Bitsor4mm: 10 x 4mm Drill Bitsor5mm: 10 x 5mm Drill Bitsor6mm: 10 x 6mm Drill Bitsor 8mm:10 x 8mm Drill Bitsor 10mm:5 x 10mm Drill Bitsor12mm:5 x 12mm Drill Bits