The SmallRig 12mm/15mm Single-Rod Clamp helps you link your existing cage with follow focus or other rod-supported accessories. Designed to fasten to a number of camera cages, this device includes a 12mm rod clamp adapter to boost its versatility to support a wide range of essential add-ons. Its locating pin prevents the clamp from rotating under the weight of your accessories (available separately). The single-knob screw makes for quick installations and breakdowns both before and after a long day of shooting.