15 mm Rod Support for the Matte Box 2660. Special double rod holder for the SmallRig Matte Box 2660. The semi-open rod clamp features a tool-free snap-on design. It is attached to the matte box with a 1/4"-20 screw and has a anti-twist structure to ensure stability. It is vertically adjustable by 20.5 mm to allow a distance of 80 to 100.5 mm between the center of the double rods and the center of the lens. Dimensions: 102.5 x 48 x 47 mm. Material: aluminum alloy, stainless steel. The SmallRig 15 mm Rod Holder for the Matte Box 2660 is designed to attach the Matte Box 2660 (if needed with silicone nut 3409) to a 15 mm rail system. It connects to the bottom threaded hole of the Matte Box 2660 with a 1/4"-20 screw, ensuring safety and stability, and features a semi-open rod clamp that allows for quick mounting on the rail system without the need to disassemble other accessories. The tool-free rod mount has a knurled screw and a knob that can be adjusted vertically by 20.5 mm to allow a distance of 80 to 100.5 mm between the center of the double rods and the center of the lens.