Specification:Item Type: Diamond Hole Saw Drill BitMaterial: DiamondSize: Approx. 65 ~ 8mm / 2.6 ~ 0.3inHole Diameter: Approx. 8mm / 0.3inUses: Suitable for drilling holes in marble, concrete, granite, ceramic tiles, glass, etc.Package List:10 x Diamond Hole Saw Drill Bit Note:1. The hole opener is installed on the electric drill. Since this hole opener does not have a center positioning drill, operate carefully and pay attention to safety.2. Continuously add water to cool, dry drilling is strictly prohibited, high temperature friction occurs, causing serious wear and tear and affecting the use effect.