Features:Made of aluminum alloy, very durable and sturdy.Standard 1/4" threads, can be directly mounted on 1/4" thread of devices.Fast loading base with antiskid lock function. With scale plate and built-in bubble level, very convenient for use. Jaw can be opened from 37mm to 42mm, suitable for any Arca style quick release plate.Specifications:Material: Aluminum AlloyColor: BlackPackage List:1 * Clamp for Quick Release Plate1 * 1/4" Screw