Chungking bristles mounted into hardwood hubs with 1/4" arbor holes for use on the tapered spindles of polishing motors.Genuine Chungking bristle insures longer life & superior polishing action piece after piece. Wood hubs are seasoned hardwood and oil-treated to prevent splitting and guarantee long-lasting service. Bristle tufts are staple-set into hubs to remain securely fastened until completely worn down. 2 rows of converging bristle. Hub Diameter - 1-5/8" Trim Length - 11/16" Overall Diameter - 3"