Description:What achieves fast chip removal is the design of the U-shaped chip groove, which allows for smooth drilling operation.Featuring sharp edge with better wear resistance and high hardness, the drill bit makes your punching works effortless.Made of premium hard alloy material, the drill bits are durable and safe to use.Available in 4 specifications (4mm, 5mm, 6mm, 8mm), the drill bits have length of 82mm, 82mm, 100mm, 116mm respectively.Triangle drill bits are widely used for drilling ceramic, tile, marble, concrete, glass, sheet metal and other materials.Item Name: Triangle Drill BitsMaterial: Hard AlloySpecifications: 4mm, 5mm, 6mm, 8mmShank Type: 4mm: Round Shank, 5mm, 6mm, 8mm: Triangular ShankFeatures: Stable Operation, Anti-Slip, Fast Chip RemovalSize Details: 4mm: Total Length: 82mm/3.23", Drill Diameter: 4mm/0.16", Working Length: 43mm/1.69", Shank Diameter: 3.5mm/0.14" (Approx.)5mm: Total Length: 82mm/3.23", Drill Diameter: 5mm/0.2", Working Length: 43mm/1.69", Shank Diameter: 4.5mm/0.18" (Approx.)6mm: Total Length: 100mm/3.94", Drill Diameter: 6mm/0.24", Working Length: 56mm/2.2", Shank Diameter: 7mm/0.28" (Approx.)8mm: Total Length: 116mm/4.57", Drill Diameter: 8mm/0.31", Working Length: 70mm/2.76", Shank Diameter: 7mm/0.28" (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:10 x Triangle Drill Bits