PB 3305371 14" Pad Driver with Lugs and Centering Device for Power Boss Scrubbers. Short trim polypropylene filament is secured to a solid, molded plastic block. This short trim pad driver includes a pad grabbing centering device which securely holds your floor pad to the block. Include 3 drive lugs (arranged around a 5-1/2" center hole). These are the older style pad drivers used on models including 62, 65, 78, 80 and 82 Series scrubbers. Please check your model before ordering. For the newer Powerdrive style clip-on pad drivers, use 3315494, 14" pad driver. Most machines require 3 brushes/pad drivers (4 if using a side scrub brush). Priced each. Replaces Minuteman / Power Boss 3305371