Description: Features an o-ring for positive sealing. Stop water infiltration and to drain water out of inner hull of the kayak. Fine threads maintain sealing under high vibration conditions. Retention system keeps plug from getting lost when removed. Size Chart: Press board size: Approx 5.6*3.1*1.4cm / 2.2*1.2*0.6 inch (L*W*H) Plug outside diameter: Approx 2.6cm / 1 inch Plug length: Approx 5.7 cm / 2.2 inch Package Includes: 2 x Drain Plugs 4 x Screws