This bristle style pad driver is different from our 15" harpoon style pad driver. It does not come standard with any of our rotary buffers, but it can be purchased separately. The bristles from the pad driver hold the pad underneath the machine during the scrubbing of floors and carpets. The pad holder comes with a standard clutch plate for use with standard 175 RPM floor buffers. If this not the style pad driver that you were looking for, please take a look at our complete line of floor buffer pad drivers.