Water Self-Feeding Design - No sponge needed! The built-in water channel draws water directly from the chamber, keeping the grinding area cool and reducing dust for smoother operation. The drill bit is hardened with to enhance its performance, strength and . 2 piece of grinding bits in size 5/8 inch, along with 1/4 matching hex wrench. The glass grinding head features a standard frosted design, making it an optimal tool for shaping different shapes of glass, ceramic tiles, stone, and similar materials., Weight: 0.19180216794 pounds, Manufacturer: Awwertse