For sale is a Ingersoll-Rand Size 99V60P107 Heavy Duty Right-Angle Pneumatic Grinder. 6,000 RPM Rated speed. Uses 5-1/2" diameter cup-type grinding wheels. 90 PSIG / 6.2 bar Rated air pressure. NOTE: I performed a basic air test on this grinder; it spins-up correctly, and sounds fine. Several similar units available - all from a single manufacturer's plant that has been closed-down.