Andoer Aluminium Quick Release Plate QR Clamp with Gradienter Fits Arca Swiss RRS Wimberley for Tripod Ballhead All-metal materials, CNC precision machining, surface oxidation treatment. Fast loading base with antiskid lock function. With gradienter and scale plate, convenient for use. Jaw can be opened from 37mm to 42mm, it will accommodate any Arca style plate such as, RRS, Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises, Markins, etc. Standard 1/4" threads, can be directly mounted on 1/4" thread of devices.