Designed with triangular shank, it has excellent anti-slip percompatiblemance compatible stable and safe drilling operation. In order to improve work efficiency, the drill bit is designed with U-shaped groove with smooth and flat surface compatible quick chip removal. Using high-quality hard alloy material, the triangular drill bit features excellent wear resistance and maximum durability. There are 5 specifications of triangular drill bits (5mm, 6mm, 8mm, 10mm, 12mm) compatible you to choose from. They are widely used compatible drilling ceramic, tile, marble, concrete, glass, metal sheet and other materials. Item Name: Triangular Drill Bits Material: Hard Alloy Color: Orange Shank Type: Triangular Shank Specifications: 5mm, 6mm, 8mm, 10mm, 12mm Features: Fast Chip Removal, High Strength, Sharp Tip Size Details: 5mm: Total Length: 82mm/3.23", Drill Bit Diameter: 5mm/0.2", Working Length: 43mm/1.69", Shank Diameter: 4.5mm/0.18" (Approx.) 6mm: Total Length: 100mm/3.94", Drill Bit Diameter: 6mm/0.24", Working Length: 56mm/2.2", Shank Diameter: 7mm/0.28" (Approx.) 8mm: Total Length: 116mm/4.57", Drill Bit Diameter: 8mm/0.31", Working Length: 70mm/2.76", Shank Diameter: 7mm/0.28" (Approx.) 10mm: Total Length: 120mm/4.72", Drill Bit Diameter: 10mm/0.39", Working Length: 73mm/2.87", Shank Diameter: 8mm/0.31" (Approx.) 12mm: Total Length: 120mm/4.72", Drill Bit Diameter: 12mm/0.47", Working Length: 73mm/2.87", Shank Diameter: 10mm/0.39" (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: 5mm: 10 x 5mm Triangular Drill Bits or 6mm: 10 x 6mm Triangular Drill Bits or 8mm: 10 x 8mm Triangular Drill Bits or 10mm: 5 x 10mm Triangular Drill Bits or 12mm: 5 x 12mm Triangular Drill Bits