You get the craftsmanship of the classic metal floor machine with the dependability of all metal construction and the features for the most challenging floor jobs. Rugged, all-steel triple planetary drive system. The 20" 1.5 hp Classic floor machine is powerful enough to handle tough jobs like grinding, but can also be used for more delicate jobs such as buffing finished floors. All metal handle housings, tube and trigger assemblies add to the long-lasting durability of the machine. Thumb activated safety interlock switch prevents accidental start-ups. Full surround non-marking bumpers help prevent damage to walls and furniture.