The RBK-1 is a 1RU 3.0 inch (75mm) deep recessed bracket to mount any 1 RU product. This is great for mounting power strips and breakout panels at the rear of racks or cases with rear doors. We also offer the RBK-2, the 2RU version and the RBK-3, the 3RU version. Sold in pairs. All RBK versions come with 10/32 captive bushings (pemnuts). If you require, request 10/32 screws (4 per RBK) to be shipped with product.