17" diameter. Heavy-duty 1.5 hp floor machines perform a multitude of cleaning tasks on various flooring types stripping, scrubbing, sanding, scraping, grinding, shampooing, encapsulation cleaning and bonnet cleaning. You won't find a more versatile floor care machine. Scrub Brushes and pads not included.  Low profile design for getting under baseboards and around obstructions. Thumb activated safety interlock switch prevents accidental start-ups.  Full surround non-marking bumpers help prevent damage to walls and furniture