Molded, glass fill nylon construction for years of trouble-free service The Oar Right clamps securely to the Molded Oar Sleeve with two beefy stainless steel bolts The spline of the Oar Right fits between the horns of an open oarlock to lock your oar blade For Carlisle and Cataract oars, use the Molded Oar Sleeve with the Oar Right for proper fit Spline moves up to allow feathering, sold individually The NRS Convertible Oar Right - The NRS Convertible Oar Right keeps your oar blade in the right position for full-power strokes but also allows you to feather your oars. The spline of the Oar Right fits between the horns of an open oarlock to lock your oar blade in position for the most effective stroke.