The CommScope Mounting Hardware for FIBRBOX-ACC-BRKT-HDW (vendor part 359931-000, Millennium part 617563) secures a FIBRBOX splice enclosure to a strand or wall mount bracket, giving aerial and building-entry splicing crews a stable mounting point for the closure. It's the hardware kit that pairs specifically with FIBRBOX-series brackets rather than a universal fit, so techs should confirm bracket compatibility before ordering. Reliable mounting keeps the enclosure from shifting or stressing the splice trays inside over time. Stock it with the matching FIBRBOX bracket and grounding hardware kit.