Description: Unique cross angle design makes the incision resistance small. High quality and exquisite workmanship make it smooth and not easy to break. The wide range of applications makes it very reliable and practical. Large number allows you to use it for different work scenarios. Made of hard alloy material, it is very durable to use. The length of the storage box is 10.2cm, the width is 9.5cm and the height is 1cm. 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: Black Features: Efficient, Anti-rust, Universal Size Details: Box Size: 10.2cm x 9.5cm x 1cm/4.02" x 3.74" x 0.39" (Approx.) 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.) 8mm: Total Length: 8cm/3.15", Drill Bit Head: 0.8cm/0.31" (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: 10 x Triangle Drill Bits