TARION Professional Gear Ring Belt with Aluminum Alloy Grip for Follow Focus System 49-82mm Lens High quality aluminum alloy grip for durable using. The built-in stainless steel screws meet global standard. Large external diameter design fits for most cameras. Belt Length: Approx. 36cm/14.2". Gear Module: Film industry standard 0.8 threads. Package only includes 1Pc and fit for lens size: 49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm.