Quick-release version.Easily and quickly attach and detach * Material: Metal and plastic. Adjustable locking systems. Mounts onto 15 mm Rod Support (60mm center to center difference). * MOD Drive Gear: Industry standard 0.8 Net weight:250g * It is with high quality,and light in weight.It is consisting of a improved gearbox,which promise no backlash or less backlash(<0.5mm). * It can work with 3 different size gear to meet your different need with various lens: . 38T gear: 38x0.8mm pitch,diameter is approx.28mm. . 43T gear: 43x0.8mm pitch,diameter is approx.31mm. . 65T gear: 65x0.8mm pitch,diameter is approx.49mm. Only 1pcs gear included in this link,but you can choose the one you want.If we do not get any notification from you before shipping,we will ship the standard 43T.