The QC-38 Quick Release Clamp from Sirui is designed to make it quick and easy for you to attach and remove your camera from tripods to keep your workflow efficient. With a special proprietary clamping system, an included Arca-type plate that can be inserted in four directions, and a bubble level, the QC-38 helps you adjust on the fly to find your optimal setup while its slim and portable design makes it perfect for shooting on the go. The clamp can be mounted by either its 3/8"-16 screw or with the help of the included 1/4"-20 reducer bushing for expanded compatibility.