1、Features an o-ring for positive sealing 2、Fine threads maintain sealing under high vibration condition 3、Retention system keeps plug from getting lost when removed 4、Stops water infiltration and is used to drain the water out of the inner hull of your boat 5、Ideal for boat transoms, fish wells, ice chests and more Description: Material: PP Color: Black Press board size: Approx 5.6*3.1*1.4cm / 2.2*1.2*0.6 inch Function: Stops water infiltration and is used to drain the water out of the inner hull of your boat Features: Features an o-ring for positive sealing Fine threads maintain sealing under high vibration conditions Ideal for boat transoms, fish wells, ice chests and more Package Included: 4 x Screws