1.316 Stainless Steel Edge Mount Oar lock Sockets provide more horizontal sheer strength as it is attach to the inside of the gunwale and are screwed on the top and side. 2.Mirror Polish Finish, with plastic bearings to prevent rattling while Oar lock in use. 3.Durable 316 Cast Stainless Steel construction provide superior corrosion protection perfect for harsh enviroment. 4.Sockets are for use with 1/2 inch diameter shank oarlocks. Product name: oar socket size:about 89x25.4mm Material:stainless steel colour:Silver Package Contents: 2 x oar socket Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.