Neewer Aluminum Alloy Film Movie Making System 15mm Rod Rig Baseplate with 1/4 inch Quick Shoe Plate for DSLR CameraMount Follow Focus,Matte Box The base plate is a aluminum alloy multi-functional standard rail system that can be used for mounting HD DSLRs and various accessories like Follow focus/ Matte box etc. This Rail System has a central Tripod Mounting plate that makes a perfect balance between the camera and the front mount accessories (35mm Adapter/Matte box/Follow Focus). Plate With the 1/4" screw, compatible with most DSLR/DVR. The Tripod Mounting plate with the 1/4" and 3/8" screws threads, compatible with many support and tripods. Built-in Lens Support, usefully support any lens and protect your lens with the smooth contact. Note: Rod Screw Thread: M12*1.75MM. Please be sure it is compatible with your device before buying.