Item Type: Rowlock Socket Material: 316 Stainless Steel, ABS Aperture: 1/2in Mounting: 4 x10 screws to install each socket (not delivered) Package List 1 x Rowlock Socket 1Application Details: Socket is specifically designed for use with 1/2 inch diameter shank oarlocks, suitable for salt water. 2Unique Design: Mirror polish and plastic bearings prevent rattling while the oarlocis in use, bringing you an excellent use experience. 3Rust Proof: Durable 316 cast stainless steel construction provides excellent rust protection for use in harsh water environments. 4High Performance: Oarlock sockets provides more horizontal absolute strength, which is attached to the inside of the gangway wall and screwed on the top and side. 5Delicate Appearance: Sockets have a smooth surface and exquisite appearance that will maintain its bright look after a long time in the water.