Description:Unique cross angle design makes the incision resistance small. The wide range of applications makes it very reliable and practical.The smooth and burr-free surface will not hurt your hands. High hardness and wear resistance make it can be used for a long time.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 BitMaterial: Hard AlloyColor: Silver ColorFeatures: Sturdy, Multifunctional, Wear-resistantSize 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