nVent Schroff, HF-BODY TUBE 3U 21HP 167.0D, HF Frame Type Plug-In Unit Body Tube, 21 HP, for 160 mm Deep PCB, Black HF body tube, for HF frame-type plug-in unit., The black HF body tube, for HF frame-type plug-in unit enables a user to insert PCBs, The tube offers a shielding against high-frequency radiation, Module body with cooling Fins, Plug-in unit can be mounted in a subrack or fitted laterally to a mounting plate with the slide nut