Our pneumatic grinder is reinforced with a metal shell, a durable construction with precision machined ball bearings and steel gears. The main components undergo special industrial treatment, which makes them lighter, more wear-resistant and more durable. Our pneumatic grinder has a safety lock that ensures that it will not accidentally ignite. Note: When using this tool, we suggest that you use occupational safety protection tools, such as work glasses, work gloves and hearing protection. The air grinder has ball bearing construction, provides 20,000 RPM operation at 90 PSI and 4 CFM air consumption; combine with an air compressor to perform precise, high-power grinding tasks on the go. The pneumatic angle grinder has the characteristics of light weight, low vibration design, easy operation and is ideal for glass polishing, jewelry polishing, ceramic milling and cutting stone., Weight: 2.18147408249 Pounds, Manufacturer: Rtxbvg