Koblenz 3500 RPM Accelerator Surface Prep MachineThis square machine is great for prepping surfaces and, unlike round floor machines, can get into corners. Add on weights for extra performance SPECIFICATIONS Motor: 1. 5 hp induction with sealed ball bearings 3500 rpm brush speed HP: 1. 5 Cord length: 50 ft Speed: 3500 rpm 20 Inch x 14 Inch rectangular pad Heavy duty cast iron chassis Cast aluminum pad driver