Futurece 15mm Rod Clamp Rail Rig System Camera Accessory For DSLR Camera SmallRig 15mm Clamp 1495 used for mounting small lightweight monitors, recorders, hard drives, or any device that accepts a 1/4" 20 screw or a 3/8" 16 screw (with a 3/8 16 to 1/4 20 Screw Adapter) to an articulating arm or 15mm rod end to give you quick release action Very easy to build and use Anodized for Durability