The re are various standard s of rosettes, but arri is one of the industries’ most common withan outer diameter of 31.8mm, 60 teeth witha 3/8in locating pin, and an m6 internal thread. The Kupo 3/8in arri rosette adapter withlocating pin (m6) is perfect for cameras or camera cages witha 3/8in internal thread. Made of stainless steel and aluminum, this Kupo arri rosette mount features an m6 internal female thread designed for mounting arri standard rosette-style accessories and allows for 360 degree rotation.