Ensure your oar blades maintain the correct angle so you can stay on your line. The Blade Rite Oar Stops work with oar sleeves and oar locks to keep you at the top of your game. Unique design increases the downward oar range of motion by up to 30%. Per each. Available: Small 1-3/8 diameter oars. Large 1-7/8 diameter oars. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Oar Stops.