The CAMVATE M5 Rotating Knob Adjustable Thumb Lever Screw is made of CNC-machined aluminum. It features a spring-loaded lever that lets you readjust the lever position when working in tight spaces. It is compatible with a 15mm rod clamp, rod clamp with 1/4"-20 mount, DSLR handgrip with 15mm rod clamp, the Rod Clamp Extender Riser Rail Block, and all standard M5 threaded accessories, such as camera rigs, cages, QR plates, shoulder supports, and so on.