The Digital Juice Butterfly C-Stand Frame Clamps (Pair) make mounting the 8x8' Butterfly frame to C-Stands easy. Made of the same sturdy aluminum that the frame is, each clamp slides on to the frame and is secured by 2 hefty polycarbonate knobs. Pressure plates are built into the jaws of the clamp so that there's no danger of the tightened screw denting the frame. The 5/8" diameter stud at the end of the clamp fits neatly into a grip head atop the C- stand. The frame can then tilt 360 degrees between the stands.