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 bit.* Unique cross angleSmall notch resistancefeature drilling stable, speed, no breaking the limit. Opening neat, smooth, no broken edges, no shaking phenomenon, easy chips.* Wide ApplicationProfessional glass and tile drill bits provide smooth and accurate drilling in ceramic tile, marble, thin iron, mirrors and glass. Be sure to add water or coolant when drilling.* 5 different sizesSuitable for different needs. It can be installed in general electric hand drill, bench drill. The drill clamp of the machine is 10mm and above. Specifications:Material: Cemented CarbideColor: As the picture shownSize: 3*70mm, 4*70mm, 5*76mm, 6*77mm, 8*80mm (Approx.)Quantity: 5pcsPackage Content:5*Universal Drilling Tool