➤ Made of 316 Mirror Polished Stainless Steel,Anti-corrosion,Perfect For Harsh Enviroment.➤ Dimensions:Length : 90mm,Width : 21.8mm,Diameter : 1/2"(12.7mm).➤ The Sockets are for use with 1/2 inch diameter shank oarlocks.➤ Attach to the inside of the gunwale and are screwed on the top and side.➤ With plastic bearing, prevent rattling while use, perfect for Sea Kayak.