Features: * 100% brand new and high quality. * High quality materials. It is made of high quality YG8 alloy as raw material. Oxynitriding process cutting head strengthen the hardness of the drill.*Unique cross angle Small incision resistancefeature drilling stably, fast, not breaking the boundary. Opening neat, smooth, no broken edges, no shaking phenomenon, easy chips.* Wide application Professional glass and tile drill bits ensure smooth and accurate drilling into ceramic tiles, marble, thin iron, mirrors and glass. Remember to add water or coolant when drilling.* 5 different sizes Suitable for different needs. Can be installed in general electric hand drill, bench drill. The drill clamp of the machine is 10mm and above. Specifications: Material: Carbide Color: As picture shown Size: 3*70mm, 4*70mm, 5*76mm, 6*77mm, 7*80mm,8*80mm,10*83mm,12*83mm(Approx.)(Optional) ) Package Contents: 1 * Universal Drill Tool