RAM MOUNTS Mari-Nut Rubber Expansion Brass Nuts (4 Count), Black Locate RAM base to desired mounting location, drill holes with 3/8" drill Place Mari-Nut insert all the way into pre-drilled 3/8" holes until flange is firmly secured against mounting surface Align RAM base over Mari-Nut and 3/8" pre-drilled holes Pass machine screw through base to be fastened Lifetime warranty