Specification:MATERIALS: Cemented CarbidePRODUCT WEIGHT: 125GPRODUCT SIZE: 3*73/4*74/5*75/6*76/8*78 3mm+4mm+5mm+6mm+8mmFeaturesIt is made of high quality YG6X alloy as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness.UNIQUE CROSS ANGLE DESIGNSmall incision resistancefeature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.WIDE USAGEProfessional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, mirrors and glass. Remember to add Water or coolant when drilling.5 DIFFERENT SIZESSuitable for your different needs.It Can be installed in the general electric hand drill, bench drill. The machine drill clamp range is 10mm and above.Package5pcs x Universal Drilling Tool(3mm+4mm+5mm+6mm+8mm)