Ceramic Tile 38mm Diamond Hole Saws Glass Hole Saw Drill Bit with Center Pilot Bit for Glass 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 and 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 or 2 inch. <b>Product Description< or b> <b>Description:< or b> 1. Smooth and precise finish to reduce cutting resistance and drilling pressure, increasing sharpness and effectiveness of water lubrication. 2. Produce clean, accurate holes in minutes with little or no chipping. The pilot bit in the center cuts precise holes. 3. White zinc plating on the bits maximizes tool life with high corrosion resistance. Excellent for drilling glass or ceramic and greatly extending the life of the bit. 4. Diamond drill bits along with the clearance hole facilitate the entry of cooling water and the escape of chips and other particles from drilling. Facilitates the drilling process. 5. Suitable for processing stone, tiles, ceramics, glass and granite, etc. Works best with an electric drill (excluding the item). Specifications: Material: Diamond, Carbon Steel Features: with Center Pilot Bit Finish: White Zinc Plating Package: 1pcs x Diamond Drill Bit Using Note: 1. Please always use lubrication (water) when the drill bits are working. 2. Low drilling pressure and increased use of water lubrication will extend bit life. 3. Do not use on concrete or for depths beyond approximately 1 or 2 inch. LRFR is committed to providing each customer with the highest standard of customer service. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.