Description: Black nylon boat bung drain plug with surface polished stainless steel flange base Screw type drain plug with a red o-ring washer for positive sealing Retention system prevents plug from getting lost when removed Mounts in a 1"/25mm diameter hole in hull Great replacement accessories for marine boat, yacht, raft, kayak, canoe, dinghy and so on Specification: Material: Nylon, stainless steel Color: Black, silver Bung Outer Diameter: Approx. 2.5 cm/1 inch Flange Size (L x W): Approx. 5.1 x 3.8 cm/2 x 1.5 inch Screw Hole Diameter: Approx. 0.5 cm/0.2 inch Package Includes: 1 Piece Boat Drain Plug Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!