When integrated with a SmallRig cage, the SmallRig 12mm/15mm Single Rod Clamp 3598 becomes an essential component of your professional shooting system, offering a seamless follow focus solution. This versatile rod clamp is designed to support SmallRig cages 3440, 3277, 3278, and 3212, ensuring a secure fit through a 1/4""-20 knob screw and a locating pin. Engineered for compatibility with a 15mm rod, this single rod clamp also accommodates a follow focus system using a 12mm rod, thanks to the included 12mm rod clamp adapter. The user-friendly knob screw design simplifies the process of installation and removal, enhancing your efficiency on set. Please note, when mounted onto cages 3212, 3277, or 3278, this rod clamp is not designed to connect with a universal side handle using 1/4""-20 screws.