This listing is for one parallel boat roller and bracket. The parallel side roller and bracket are styled as pictured. They are high quality and OEM standard. The roller is made from heavy-duty rubber, which absorbs impacts far better than cheaper plastic rollers, and the bracket is made from steel which is plated to prevent corrosion. Roller sizes: 202mm total length, 56mm diameter, 16mm bore size. Bracket sizes: 220mm total width, fits on to a standard 34mm stem. Mounting bolt included. The roller and bracket are also available individually in our shop. We have other boat rollers and keel blocks available in our shop.