Black Wood Racks WRB-4 Depth 404mm 4HE Units. AllWRB racks are 517 wide - Quality Connection , black laminated . 19"profiles with M5 thread , panted black. Includes all mounting hardware and instructions. Easy assembly. These racks provide a beautiful and economical way possible to mount 19"devices in home , studios,residental facilities, conference rooms,classrooms,restaurants and Churaches.