Fellowes Perf-Ect Partition Additions Step File, Six 1-1/8" Compartments, Black (22316) Perf-Ect Partition Additions Step File. Frees valuable desktop workspace. Universal mounting bracket fits panels 1-1/2" to 3" thick. Frees valuable desktop workspace. Universal mounting bracket fits panels 1-1/2" to 3" thick. Upscale perforated metal/wire design. Partition mount only.