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. Style # B29, 4 rows of upright bristle. Hub Diameter - 1-5/8", Trim Length - 11/16", Overall Diameter - 3" 12/pkg