SIZE - 95mm(3.7-inch) Drilling Diameter, 10mm(0.4-inch) Shank Diameter. DIAMOND COATED - Diamond coating enhances the drilling speed, which makes the bit more sharp. NICKEL PLATED SURFACE - Nickel plating surface can extend the service life and enhance the surface corrosion resistance. SPECIAL DESIGN - Slotted edge makes it more sharp, works more efficient. Side open can remove the waste to keep the drill bit clean. APPLICATIONS - Perfect for drilling glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, light stone and fiberglass. (Need to be used at a low speed; Always use lubrication (water) when processing, otherwise the hole saw will burn.)