GB350 is a 3.5” wide cover by 1.5” deep Full Synthetic Protective bunk cover made for Standard 2x4 bunks on Flat. Gatorbak Synthetic Bunk Cover kits are a total replacement for bunk carpet. These bunk covers are for use with Standard 2x4 Lumber or Metal tube mounted on flat side. They are easy to install and easy to use. Our unique deep rib design allows Water and debris to rinse away easily. Reduces the spread of Invasive Species and Protects against Hull blistering and corrosion. Replace your old worn out, dirty, and wet carpeted bunks with a SOFT, synthetic material bunk cover that is made to last.