The RK-T2SB-B is an adapter for mounting two Kramer TOOLS™ devices into a 19” (1U) rack: one in a regular housing and one in an elongated housing. All devices suitable for use with the RK-3T also fit for the RK-6T, RK-9T, RK-1T2PT, RK-2T1P and RK-T2SB adapters. Color: black.