When connecting Houdini Speedrail Clamps and Houdini Rod Clamps, the tough and durable 3/8"-16 x 3" CineMilled 360° Houdini Clamp Bolt will serve your needs. Made in the USA from 318 stainless steel, the screw resists corrosion, even if completely submerged in salt water, allowing you to create a long-term rig that can be disassembled about as easily as the day you built it.