The XM-BTHSG-2919-02 is a Benchtop Machined Housing with Top and Bottom Lids and Optional Top Heatsink. This version includes two Micro-D connectors (MWDM2L-15P-6K7-18M) with jackposts. The overall size (including the feet flanges) is 5.365 x 2.815 x 1.365 including both lids (not including the optional Heatsink). The XM-BTHSG-2919-01 is machined Aluminum with E-Nickel Plating.