The RMK-2/10 is a rackmount kit designed to accommodate two MikroTik devices in 19" racks, compatible with the SR-10U, or alternatively, a single 200mm device in a 10" rack.
Brand
MikroTik
Title
MikroTik 1U Dual or 10" Mounting Bracket |RMK-2/10-MT-RBRMK-2-10