30% additional fill gives more body for the right feel and longer brush life. Metal hubs with thinner profiles are assembled on specially designed production equipment. The result is a perfect brush. Bristles wonÆt split and washerswonÆt spin. Available in 4 grades to perfectly match every production requirement. Sold by dozen. For use on tapered spindles of polishing motors, use mandrels 47.258 or 47.259. For use on flexible shafts, use mandrels 43.160 or 43.162.