The Genus G-FRRB 15mm Fixed Rod Riser Bracket is designed for taller cameras like the Canon 1D Mark IV that have a height to allow rods to run above the base. It allows you to use the accessories that adhere to the 15mm lightweight rod standard for lens height, but will still be able to run rods beneath the camera. Made of aviation-grade aluminum, it can either be used with the Genus D-SLR C bracket (a part of the Genus DSLR shoulder rig) or as a stand-alone unit. Accessories can get close to the camera body without the barrier of lock-offs, as you can screw 15mm rods on to the rod riser bracket. With the central lock-off, the height of the riser bracket can be adjusted on the Genus D-SLR C bracket. The rod riser bracket can also be used on other 15mm rod systems where adjustment is not required.