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: 20in; Power Capacity: 1.5 hp.