【Size】Diameter 1-1/2''(38mm); Total length 75mm; Diamond height 15mm; Diamond Grit: #35/40; 5/8''-11 Thread 【Application】Diamond Core Drill Bits for dry or wet drilling holes in Porcelain Ceramic Tile Marble Granite Artificial Stone Quartz, etc. Wet drilling will greatly prolong the drill bits life 【U-grooves Design】U-grooves good design for heat dissipation and debris removal, with higher efficiency and better performance 【Hot Performance】Vacuum Brazed technology and #35/40 high-quality diamond grains provides high efficient working performance, faster drilling speed and longer service life 【Recommended Machine】The drill bits are usually suitable for 5/8''-11 thread angle grinder. Recommended speed 6000RPM, maximum speed 11000RPM. If you want to use electric drill or other machine, you can use SDS or Hex Shank Adapter