Our air die grinder is fortified with metal housing, ball bearing construction, and -machined steel gears. The core components undergo special industrial treatment, which is lighter, longer wear and longer product life air die grinder has a ball-bearing construction, provides a robust 20,000 RPM operation at 90 PSI and 4 CFM air consumption, pair it with a air compressor for precise, high-powered grinding tasks every time Our air grinder have safety lock ensures zero accidental startups. Note: when using this tool, we suggest you need to wear occupational safety protection tools, such as work goggles, work gloves, and hearing protection The air angle die grinder has the characteristics of light weight, low vibration design, easy operation, and is ideal for glass grinding, jewelry polishing, ceramic milling, stone cutting, Weight: 1.49032489112 Pounds, Manufacturer: Prterver