What makes fast chip removal possible is the design of the spiral chip groove, which can increase your efficiency. Featuring sharp edge, the drill bit allows for fast drilling. Hex shank allows for secure clamping to prevent slipping. Hard alloy drill bits feature excellent wear resistance, impact resistance and toughness. The drill bits are 100mm, 115mm, 122mm, 125mm long respectively. Multi-function triangle drill bit can drill through various materials such as ceramic, tile, glass, concrete cement, etc. Item Name: Triangular Drill Bits Material: Hard Alloy Shank Type: Hex Shank Color: Golden, Silver, Black Specifications: 6mm, 8mm, 10mm, 12mm Features: Wear-Resistant, Fast Chip Removal, Anti-Slip Size Details: Shank Diameter: 6.3mm/0.25" (Approx.) Drill Bit Length: 6mm: 100mm/3.94", 8mm: 115mm/4.53", 10mm: 122mm/4.8", 12mm: 125mm/4.92" (Approx.) Notes: 1. Water must be added for cooling when drilling, and the strength should be light and very gentle, especially especially at the beginning of the drilling and when it is about to drill through. 2. After use, please wipe clean the surface stains of the product, and apply anti-rust oil to prevent rust 3. All kinds of hand tools must be installed according to the correct steps, and it is forbidden to use the tools before they are installed. 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: 5 x Triangular Drill Bits (2x6mm, 1x8mm, 1x10mm, 1x12mm)