This 17 inch replacement pad holder is used with the Clarke CA30 17E electric auto scrubber. A pad driver is made to replace the brush that comes standard with your purchase of the Clarke CA30 17E electric auto scrubber. On the underside of the pad holder, the teeth keep the pad attached along with the center locking nut in the middle of the driver. With the use of the correct type of 17″ pad, you can customize your scrubber for nearly any flooring surface. Paired with the right floor solution and you will be set to scrub any type of floor.