Uni-Grip Universal Sensor Holder Combo Pack for Film/PSP. Uni-Grip for Faster FMX! The Rinn Uni-Grip holder is designed to produce an entire full mouth series using only one holder. Sliding the bitepiece along the channels enables you to take anterior, posterior and bitewing x-rays. One per procedure is all you need. Adjustable Bite Tab for posterior, anterior and bitewings. Works with Film/PSP imaging plates. Compact design means less bulk for smaller mouths. Use with Uni-GripAR positioning Arm & Ring for stress-free paralleling.