Carpet shampooing is faster and more efficient than ever before! The Powr-Riser adjustable showerfeed brush has a glider in the center that carries the weight of the floor machine, allowing the full bristle to clean. No more flattened brushes. Polyester synthetic fibers wont get soft because they dont absorb water. Unique glide adjust in 1/8" height increments for any carpet nap height. Full weight of the floor machine is on the glider, greatly extending brush life. Clutch plate not included. 5" centerhole.