Suitable for processing stone, tiles, ceramics, glass and granite, etc. The pilot bit in the center helps to cut precise holes Long Service Life: Slow drilling speeds, low drilling pressure and increased use of water lubrication will extend the life of the drill bit Clearance Hole: Diamond drill bits along with the clearance hole facilitate the entry of cooling water and the evacuation of chips from the drill bit. Makes the drilling process easier Sharp & Smooth Cutting: Diamond hole saw creates high precision smooth cuts without broken edges. White zinc plating on the bits maximizes tool life with high corrosion resistance Please Note: Water is required for lubrication and cooling when drilling. Do not use on concrete or for depths beyond approximately 1/2 inch Product Description Description: 1. Smooth and precise finish to reduce cutting resistance and drilling pressure, increasing sharpness and water lubrication efficiency. 2. Produce clean, accurate holes in minutes with little