The Rupes LH76P BigFoot 3" Air-Powered Rotary Polisher is a heavy duty, well-built machine. Its 1/2 horsepower motor can deliver speeds up to 5,000 RPM, which can strain the plate's Velcro hooks. The Rupes 9P26.058 is a direct repacement for the factory installed unit. It's a good idea to keep at least one spare on hand if you own an LH76P, as they are not all that easy to locate in a pinch. Features 3/8-24 female thread. Actual diameter 2-7/8".