If you are not using oar rights, plastic stoppers will position and keep your oars where you want them to be. Use 1400 L, large stoppers with Molded Oar Sleeves. Come in pairs. Small Stopper: Mounts directly on small-diameter shafts 1 3/8" - 1 5/8" Regular: Mounts directly on Carlisle or Cataract shafts 1 3/4" - 2" Large: For larger-diameter shafts, Molded Oar Sleeves, or wraps 2" - 2 1/4"