The Zacuto 5" Z-Rail is used to mount a variety of Z-Rail accessories to a range of compatible cameras, including the RED Epic/Scarlet, Canon C300/C500, or the Black Magic Cinema Camera, and is also ideal for use on a second camera to permit faster switching of accessories between the two cameras. It attaches via two included 1/4"-20 screws that can be spaced between 3/8" and 2-5/32" apart.