Feature:1. Diamond Coating: Our open hole drill bit's diamond coating increases the drilling speed and sharpness of the drill bit. Electroplated diamond is uniform and more wear resistant.2. 100mm Specification: Diamond hole saw bit size is 100mm or 4in, you can install and use it according to the actual situation.3. Clearance Hole: The diamond hole saw bit has a clearance hole that facilitates the entry of cooling water and the removal of chips from the hole.4. Nickel Plated Surface: This diamond hole saw drill has a nickel plated surface for longer life and improved surface corrosion resistance. Improves performance and maintains a sharper cutting edge.5. Applicable Materials: Diamond hole saw bit makes the drilling process easier. Suitable for ceramics, tiles, limestone, slate, marble, light stone and fiberglass.Specification:Item Type: Diamond Drill BitsMaterial: DiamondSpecification: Approx. 100mm / 4inUse: Combined drilling glass, ceramic, porcelain, tile, ceramic tile, limestone, slate, marble, light stone and fiberglass.Package List:1 x Diamond Hole Saw Drill Bit1 x Storage BoxNote:Not suitable for drilling holes in tempered glass, plastic and wood.