High-quality material: Made of high-quality YG6X alloy as raw material. The nitrogen oxidation process of the cutter head strengthens the hardness of the drill bit. Drills are more wear- and more . -angle design: small cutting resistance, stable drilling, fast speed, no edge damage. The opening is neat and smooth, without broken edges, no tremor phenomenon, and not easy to collapse. Widely Used: Professional glass and tile drill bit for smooth and accurate drilling on tiles, marble, sheet iron, mirrors and glass. When drilling continuously, it is necessary to add water to cool the drill bit to avoid . For example: tiles, glass blocks, glass, marble, etc. Suitable for your different needs. It can be installed on general hand electric drills and bench drills. electrophoretic paint process: full grinding and anti-rust treatment, clean and without burrs. Drills are more wear- and more . Fully automatic polishing: Polishing CNC is fully automatic, and each piece is uniform. Wide range of uses: Professional glass and tile drill bit for smooth and accurate drilling on tiles, marble, sheet iron, mirrors and glass. Remember to add water or coolant when drilling. Colour:As Shown Material:YG6X alloy Size:8.2 x 1 x 1cm Package Contents: 10 x ceramic drill bits Only the above package content, other products are not included. Note: Light reflection 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.