The ceramic drill with strong toughness and wear resistance is more than the normal drill. The with titanium treatment is antioxidant and does not fade. APPLICATION: for drilling glass, ceramics, tiles and other hard and spared materials. The set of glass drill bits help you to drill quickly and not lead to broken porcelain. HEXAGON TILE DRILL: Thanks to the hexagonal design, the drills are easy to position. In use, the drills are and do not slip. They fit most normal electric hand drill, bench drill etc. Color: golden Tile borer sizes: 3/4/5/6/8/10 / 12mm Handle length: 68,6mm, 69,7mm, 75mm, 76mm, 77mm, 82mm, 84mm, Tile drill diameter: 6.35mm (1/4 inch) Handle diameter: 2.5mm, 3.1mm, 4mm, 4.5mm, 5.4mm, 6.9mm, 8mm Tile drill material: carbon steel Note: When starting to drill or pierce the glass, you should control your power and be slow. Note: Drilling speed and pressure while drilling decrease and more lubrication (water) can effectively increase the service life. Package content: 2 x 12mm hexagonal tile drill 2 x 10mm hexagon tile drill 2 x 8mm hexagonal tile drill 6 x 6mm hexagonal tile drills 2 x 5mm hexagonal tile drill 2 x 4mm hexagon tile drill 2 x 3mm hexagon tile drill 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.