Suitable for processing stone, tiles, ceramics, glass, and granite, etc. The pilot bit in the center helps cut precise holes. Long Life: Reduced 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. Facilitates the drilling process. Sharp & Smooth Cutting: The 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 effectiveness. 2. Produce clean, accurate holes in minutes with