MFM PRO-21 -- Mercury PRO-175 Series—Super Heavy-Duty, Ultra Quiet Floor Machines Powerful scrubbing, stripping and polishing at 175 rpm. Powered by a precisionbalanced, 1.5 HP, 66-frame A/C motor. The all-metal, balanced chassis provides more precise pad pressure for beautiful results. Polished metal chassis is easy to clean and looks newer longer. 15-in., 17-in. or 21-in. traditional size all metal bell housing aprons. Scrub with a brush 2-in. smaller than the apron size, or a pad and pad driver 1-in. smaller than the apron size. Easy brush mounting with a “B”/”92” style brush drive plug. 6-in. non-marking, retractable wheels for easy transport. Fully adjustable 48-in. handle is comfortable for all operators. Safety-enhanced interlock switch on the handle leaves both hands conveniently in control. Safety-enhanced, non-conductive dual triggers eliminate shock potential. Non-marking super-thick bumper protects walls and baseboards. 50-ft. safety power cord. Motor plugs into cable at the base of the handle for easy, safe maintenance. Order pads and pad drives separately. Manufacturer’s five-year warranty on motor, gearbox and chassis. 21-inch Apron Size. Sold by the Each.