10PCS Titanium Ceramic Tile Glass Drill Bit Tungsten Carbide Cross Spear Head AUDescriptions: It is drill bit. Fits for glass, ceramic, wood, metal, plastic, tile, cement. It must be add coolant when it is being used. When drilling hole, your force should be slow, especially at the beginning of drilling and when it is drilling the glass through. Features: Material : Tungsten Steel Surface Treatment: Titanium Plating Head Type: Cross Spear Head Drill Diameter: 6mm Shank Diameter: 4. 5mm Total Length: 72mm Package including: 10x