Features: All-metal materials, CNC precision machining, surface oxidationtreatment Standard 3/8 threads, can be directly mounted on 3/8 thread of devices, such as monopod. Fast loading base with antiskid lock function. Add 1/4 conversion thread to be directly connected to the ordinary camera. With gradienter & 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.