Diecast aluminium alloy (LM2, BS1490) . EMI/RFI Screened. Stock nos. 517-3670, 517-3686, 517-3591, 517-3636, 517-3557, 517-3541, 517-3642 and 517-4083 have internal guide slots to allow the interior to be subdivided by screens, dividers, PCBs or component