The Shure URT2 rack tray is designed to securely house your Shure wireless receiver. Featuring pre-drilled holes screws & velcro fasteners to secure the PG4 PG88 PGX4 PGXD4 BLX4 BLX88 & GLXD4. The URT2 occupies 1U of rack space making it compatible with any standard rack unit. For convenient & safe transportation from venue to venue.