Pintle pins are cross-drilled to accept the RF413 Retaining Clip. The RFPNP55 Retaining Clip provides simple rudder retention security. Alloy gudgeons have insert molded Nylon bushes to provide a firm fit with pintles and avoid corrosion and fatigue. 9.5mm (3/8") transom fittings have alloy bases for greather strength. All are great for off-the-beach dinghies and catamarans.