The 4213 Reflector Holder Arm is designed to work with pop-up reflectors and backgrounds that use an internal, metal spring-frame. The 4213's jaws grasp the frame. It is extendable with 3 sections to accommodate a range of pop-up reflector sizes. Mount the Reflector Holder Arm to the top of a light stand and use the ball-socket to tilt, rotate, and move it around for best positioning.