The Stearns Universal Heavy Duty Oarlocks are made from heavy-guage steel with a bright zinc finish. Adjustable and very easy to install (no holes to drill, will clamp on easily) these oarlocks come in three different post sizes: 1/2 inch, 9/16th inch and 5/8th inch. The Stearns Heavy Duty Oarlocks are sold per pair which means when you order 1 you receive 2 oarlocks!