There are various standards of rosettes, but Arri is one of the industries’ most common with an outer diameter of 31.8mm, 60 teeth with a 3/8in locating pin, and an M6 internal thread. The Kupo 3/8in Arri Rosette Adapter with Locating Pin (M6) is perfect for cameras or camera cages with a 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.