Features 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. 100mm Specification: Diamond hole saw bit size is 100mm or 4in, you can install and use it according to the actual situation. 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. N-i-c-k-e-l Plated Surface: This diamond hole saw drill has a n-i-c-k-e-l plated surface for longer life and improved surface corrosion resistance. Improves performance and maintains a sharper cutting edge. 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 Bits Material: Diamond Specification: Approx. 100mm / 4in Use: Combined drilling glass, ceramic, porcelain, tile, ceramic tile, limestone, slate, marble, light stone and fiberglass Package List: 1 x Diamond Hole Saw Drill Bit 1 x Storage Box Note: Not suitable for drilling holes in tempered glass, plastic and wood. Package List 1 x Diamond Hole Saw Drill Bit 1 x Storage Box