Sea Dog Heavy Duty Clamp-On Oar Locks These heavy duty oar locks are easy to install and the clamps are adjustable to fit most standard oars. Recommended for freshwater use, these oar locks are composed of heavy gauge zinc plated steel, allowing for years of protection and use. They are also available with either a 12 or 916 shaft to correctly fit the oarlocks on your boat. Bolted clamp that is adjustable to fit oars between 34 and 1-12 in diameter. Features Zinc Plated Steel Heavy Duty Bolted C