High hardness and wear resistance make it can be used compatible a long time. The unique cross angle design makes the incision resistance small. The sharp characteristic makes it have a very efficient work efficiency. Fully polished treatment makes it very rust-proof and smooth. Made of hard alloy material, it is very durable to use. There are eight specifications compatible you to choose from: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm. It is a professional glass and tile drill bit that can provide accurate drilling on tiles, marble, thin iron plates, mirrors and glass. Remember to add water or coolant when drilling. Item Name: Triangle Drill Bit Material: Hard Alloy Color: Golden Color Features: Sharp, Wear-resistant, Punch Tools Size Details: 3mm: Total Length: 7cm/2.76", Drill Bit Head: 0.3cm/0.12" (Approx.) 4mm: Total Length: 7cm/2.76", Drill Bit Head: 0.4cm/0.16" (Approx.) 5mm: Total Length: 7.6cm/2.99", Drill Bit Head: 0.5cm/0.2" (Approx.) 6mm: Total Length: 7.7cm/3.03", Drill Bit Head: 0.6cm/0.24" (Approx.) 7mm: Total Length: 8cm/3.15", Drill Bit Head: 0.7cm/0.28" (Approx.) 8mm: Total Length: 8cm/3.15", Drill Bit Head: 0.8cm/0.31" (Approx.) 10mm: Total Length: 8.3cm/3.27", Drill Bit Head: 1cm/0.39" (Approx.) 12mm: Total Length: 8.3cm/3.27", Drill Bit Head: 1.2cm/0.47" (Approx.) Shank Diameter: 0.625cm/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: 1 x Triangle Drill Bit