The 1.5" diameter ball leash plug adapter attaches directly to RAM’s manufactured rugged leash plug as well as to most larger leash plugs available on the market today for SUP/Surfboards. With the simple twist of the base, quickly secure the plug adapter to the board. Add a RAM arm or fishing rod/tube holder to complete your custom SUP mount. High strength composite and stainless steel construction assures a long life of trouble free use in a wide variety of environments including marine and salt water.