Stainless Steel. Chafe-free design. Protects the hull and make anchoring much easier and safer.. AR2: A lightweight roller. AR7: Made for heavy duty use. A captive ball-lock pin holds the line or chain securely in the channel. Marithane wheel.. AR3: A long-reach heavy gauge roller. Also increases leverage to reduce the work. A ball-lock pin keeps chain within the channel. Ball-lock stainless pin. Marithane wheel.