The QC-38 Quick Release Panorama 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 while also offering the utility of 360º panoramic shooting. 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 panoramic base features engraved index marks and a locking knob for precision during panoramic shooting. You can mount the clamp by either its 3/8"-16 screw or with the help of the included 1/4"-20 reducer bushing for expanded compatibility.