Features:* Forged from high quality alloy with high hardness, wear resistance and more durable, not easy to break when used.* The tip is 4-blade design, the sharp knife can make you work more efficient and fine. U-shaped spiral flute design, drill more smoothly* Hexagonal chuck, not only fits most types of electric drills, but is non-slip, making sure it can be clamped correctly, safe operation.* Suitable for glass, ceramics, bricks, tile, wood, plastics and other materials. Specifications:* Material: Hard Alloy * Color: Black * Tool Holder Type: Hex Chuck * Blade Diameter: 3/4/5/6/8/10/12 (mm)* Blade Length: 42/55/55/55/75/75 (mm)* Full Length: 98/98/100/117/118/120 (mm)* Shank Diameter: 1/4 inch/6.35(mm)Warm Tips:1. Not recommended for lithium electric drill with power lower than 24V, because it does not have enough power force.2. The drilling direction should be changed when meeting the steel rod in the wall.3. Use water to cool down when working on vitrified tiles, all ceramic tiles, granite. Package Contents:1/5/6/7pcs x Drill Bits:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.