[High-Quality Materials]--It is made of high-quality Cemented carbide as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness.Strong drill bits. [Different Sizes]--suitable for your different needs. It can be installed in the hand drill, bench drill.Machine drill fixture range is 10mm and above. [Unique Angle Design]--Low resistance to cutting, feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. [Fine Workmanship]--Full-grinding and anti-rust treatment, clean and burr-free. The drill is wear-resistant and durable. Fully automatic polishing, every piece is uniform. [Wide Usage]--Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, mirrors and glass. Colour:Photo Color Material:Cemented carbide Size: 8x6x0.3inches Package Contents: 10 x Universal Drilling Tool( 3mm/4mm/5mm/5mm/6mm/6mm/7mm/8mm/10mm/12mm ) 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.