Professional DSLR RIG Shoulder Mount Follow Focus Whips, Crank, Matte Box Support System Kit Rig DSLR by ePhotoInc RLO3 Ultimate video camera device for movie lovers with video digital SLRs Precision engineered design with Swing-Away MatteBox 2 filter trays, supporting both 4x4 and 4x5.6" filter Follow Focus is Completely gear driven design Rail System With height adjustment.