High quality and exquisite workmanship make it have high hardness and wear resistance. Many different specifications allow you to choose the right one according to your needs. Durable and solid characteristics make it can be used compatible a long time. The low resistance and fast speed make it very reliable and good in percompatiblemance. Made of hard alloy material, it is very durable to use. There are eight specification 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: Bronze Features: High Hardness, Widely Used, Low Resistance 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