The DDC-50LR 50mm Lever-Release Clamp from Sunwayphoto is an Arca-type clamp with a 3/8"-16 threaded mounting hole that can be used to convert existing tripod heads to Arca-type compatibility, or to add to a bracket or custom camera rig. A safety lock keeps the QR plate secure, and a bubble level allows the camera to be accurately oriented in relation to horizon lines or other straight-line elements. The lever can be easily reversed for left-hand or right-hand use without tools. It can be opened to three positions: fully closed, fully open, and half-open to allow the QR plate to be positioned without being released (when used with QR plates that have safety screws). A 1/4"-20 adapter bushing is also included to convert the 3/8"-16 threads.