This air die grinder is ideal for your facility because it can be used in grinding and polishing applications. The body is made of aluminum alloy to handle everyday use in your workplace. Used for high-speed polishing and grinding applications. Made of durable aluminum alloy for lasting strength. Up to 22,000 rpm. Chicago Pneumatic 1/4 In NPT(F) Air Die Grinder, 22,000 RPM is one of many Corded Die Grinders available through Office Depot. Made by Chicago Pneumatic.