SMALLRIG 4185 FOCUS GEAR RING SEAMLESS KITThe SmallRig 4185 Focus Gear Ring Kit 62. 5 64. 5 to 81 83 fits perfectly on DSLR and mirrorless camera lenses to work with the follow focus system. Specifications The SmallRig 4185 Focus Gear Ring Kit 62. 5 64. 5 to 81 83 fits perfectly on DSLR and mirrorless camera lenses to work with the follow focus system. It includes standardised 0. 8 MOD 62. 5 64. 5 mm 66 68 mm 69 71 mm 72 74 mm 75 77 mm 78 80 mm 81 83 mm toothed rings, which are lightweight