grinding head 1)wool felt bobs,polishing felt bob 2) ... use when ordering items, according to the needs of polished subject, select moderate density of felt bob. 3. Used in polished ... s inner, outer, Corner, groove, arc, cone angle of the inner wall of the mill special mold polishing, nylon, stainless steel, high wear ... carving, stone carving, jade carving, ceramic arts, etc. grinding head of wool felt