AC4600 aviation wheel chocks are designed for mid-sized to large aircraft and aviation equipment. They are manufactured with highly durable, lightweight polyurethane, which lasts longer than wooden chocks, never needs painting and eliminates Foreign Object Damage FOD threats for aircraft. The AC4600 series feature the Rope Lock System allowing a wheel chock to be temporarily and securely attached to the opposing wheel chock on the opposite side of the aircraft tire. They are ideal for business, commercial, cargo and military aircraft.