The Really Right Stuff 450mm / 17.7" Multi-Purpose Cinema Rail is a professional camera accessory bar engineered to give photographers and cinematographers a flexible, rugged platform for mounting cameras, clamps, and other gear. The rail features a double dovetail design that works seamlessly with RRS quick-release dovetail clamps, allowing gear to slide and lock precisely along its length. Both the top and bottom surfaces have alternating 1/4"-20 and 3/8"-16 threaded holes spaced approximately 15mm apart, while additional 1/4"-20 threaded holes spaced 9mm apart run along the sides for versatile accessory mounting. Laser-engraved markings at 5mm intervals make it easy to replicate setups and maintain consistent spacing between components. Made from T6061 aluminum for strength and light weight, this 17.7" rail provides a robust, adaptable foundation for building customized cinema and photo rigs, from camera cages and monitors to lighting and audio accessories. Really Right Stuff 450mm / 17.7" Multi-Purpose Cinema Rail RRS-9000513