590GBL001572 is an open junk box mounting kit with a 4 in x 3 in x 7 in physical format. Its configuration includes a 4.0 in top plate, making the top plate a defined component of this mounting-kit item rather than a separate selection. The open junk box design defines the product type. Its 4 in x 3 in x 7 in dimensions establish the physical format for matching mounting-kit requirements. The 4.0 in top plate is the listed feature beyond the open-box dimensions, giving buyers a clear component and size combination. Use this item where mounting hardware requires an open junk box measuring 4 in x 3 in x 7 in with a 4.0 in top plate. Ordering code 590GBL001572 denotes this open junk box mounting-kit configuration.