The Genus Advanced Adaptor Bars System (GMB/A) is a masterpiece in versatility and design. It features vertical and horizontal braces which can be adjusted with a turn of a knob. This allows your matte box to be aligned perfectly without any fuss. The top adaptor plate slides back and forth to accommodate any lens length and can be removed for easy camera mounting while the base tripod plate is simple to fix onto your tripod. The GMB/A comes supplied with 170mm long 15mm support bars which can be retracted or extended as required.The bars are spaced at the 15mm lightweight industry standard 60mm.