Bowl style design is great to fix buffing wheel/wire wheel tightly, non-slip.Made of carbon steel, high hardness , rigid enough to keep flat after pressing and long service life.Suitable for mounting polishing wheel, polishing wheel, grinding wheel and steel wire brush wheel.A soft cushion needs to be placed between the grinding wheel arbor washer and the grinding wheel, and the cushion is slightly larger than the splint.Notice: The diameter of the splint on both sides of the grinding wheel shall not be less than one third of the diameter of the grinding wheel.