The Extron MBB 100 Back of Rack Mounting Kit vertically mounts most 1/8 and 1/4 rack width Extron products to the back of the rack. The Back of Rack Mounting Kit provides a simple, secure, and cost-effective alternative to Velcro or other mounting options when only using a single product. The Back of Rack Mounting Kit brackets can be attached to either side of the product.