Precision-balanced, heavy-duty 66-frame motor ensures reliable, professional-quality performance. Triple-planetary, high-torque transmission stands up to tough tasks, while minimizing gear wear. Safety-enhanced, interlocking auto-cutoff switch enables both left- and right-hand control. Nonmarking, full-wrap bumpers protect walls and baseboards from scuffs and scrapes. Fully adjustable handle accommodates nearly any user. Smooth-rolling 6-inch wheels simplify transport. PRO-175-21: 175 rpm, 20-inch drive block. Floor Machines Type: Roto-Scrubber; Handle Type: T-Grip; Brush Diameter: 20"; Power Capacity: 1.5 hp.