Strong, but light weight aluminum base, strongly bonded rubber pad, wing nuts tighten sand paper clamps. Male threaded swivel head allows you to reach all corners. For use with wash replacement 4 wood pole (not included). 9-3/8" x 3-1/4" Strong, but light weight aluminum base, strongly bonded rubber pad, wing nuts tighten sand paper clamps Male threaded swivel head allows you to reach all corners For use with wash replacement 4 wood pole (not included).