Oxitriding the cutter head increases the hardness of the drill.Oxitriding the cutter head increases the hardness of the drill.Oxitriding the cutter head increases the hardness of the drill. Full grinding and anti-rust treatment, clean and sharp without burrs.The drill is more wear-resistant and durable.Fully automatic polishing: Polished CNC is fully automatic, everyone is unified. Low cutting resistance, stable drilling, high speed, no boundary breaking.Open neatly, smooth, no broken edges, no shaking phenomenon, easy to splinter. Professional glass and tile drills enable smooth and accurate drilling in ceramic tiles, marble, thin iron plates, mirrors and glass.Remember to add water or coolant when drilling. Suitable for your different needs.Can be installed in the general electric hand drill and bench drill.The clamping range of the machine drills is 10 mm and more. SPECIFICATIONS:MATERIALS: CarbidePRODUCT SIZE: 3mm / 4mm / 5mm / 6mm / 8mm / 10mm / 12mmPACKAGE CONTENTS:5/6/7 × Universal drilling tool