Attaches to the bottom of the back foot of ALEXA, ALEXA Plus, ALEXA Plus 4:3, ALEXA M body, ALEXA XT, ALEXA XT M, ALEXA XT Plus, ALEXA SXT EV, ALEXA SXT Plus, ALEXA SXT W or ALEXA LF. Prevents the camera from resting on a back mounted battery when placed on a flat surface. Not needed on ALEXA Studio, XT Studio or SXT Studio.