HIGH-QUALITY MATERIALS It is made of high quality alloy as raw material. The process of oxynitriding of the cutter strengthen the drill hardness. ELECTROPHORETIC PAINT PROCESS Full-grinding and anti-rust treatment, clean and without burrs .The drill bit is more wear-resistant and more .Fully automated polishing: Polished CNC is fully automated, each one is unified. UNIQUE ANGLE DESIGN: Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. WIDE USAGE Professional 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. size:6mm Material:Cemented carbide colour:As shown Package Contents: 10 x Drilling Tool Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.