nVent Schroff, PIU HF 3U 28HP 167D BLACK TUBE, Frame Type Plug-In Unit Tube Kit, Shielded, 3 U, 28 HP, 167 mm, Protects a PCB against mechanical damage and discharges electrostatic buildup; for Euroboard formats., With high shielding from high-frequency radiation, To accept boards in HP grid increments, Solid body (tube) on all sides, with cooling fins