Perko Boat Cover Sockets – Chrome Plated Zinc Features: Chrome Plated Zinc Alloy Will acommodate 3/8″ wood or polymer battens up to 1-3/4″ longSpecifications: Length: 3-1/4″ Opening Dimensions: 1-7/8″ x 7/16″ Overall Width: 5/8″ Screw Size: 6