A. #10175 10"-175rpm Perfect for cleaning small and hard to reach areas. Weighs only 40 lbs. B. #160320 Variable speed scrubber/polisher 160-320 rpm, 17" to 20" brush or pad. C.#160400 Offers solution pressure spray and simultaneous liquid recovery. 100 psi pump and squeegee spray. D. #160500 Polish and clean marble and stone as well as concrete and tile. Select the appropriate weight for various jobs. Choose from 100-195 lbs. Draws less than 15 amps at 160 rpm. Uses diamond discs or various brushes.