The DPL-169 Long Lens Quick-Release Plate from Desmond is a 169mm long, Arca-type compatible quick release plate designed to help you more properly balance a camera with a larger lens attached. It features an aluminum construction with a 1/4"-20 screw for attaching a camera or lens collar. There are two safety stop screws included to prevent movement after the plate slides a certain distance and twin backstop flanges for a tight fit to a camera body when possible. Allen keys are included for convenience.