SmallRig 15mm Rod Clamp with Arri Rosette Mount 1898 is designed for shoulder rig with one M6 screw to lock. It has Arri rosette on both end to compatible with other Arri rosette accessories such as rosette arm 1684 & rosette handle such as 2784. The 15° tilt design makes a batter holding feeling. Easy to lock with only one thumbscrew, quick and convenient.