Elma enclosures are centered around 19” and 23” Eurocard specification, primarily for VME/ VME64x, CompactPCI, VXS/VPX, VXI/PXI, AdvancedTCA/MicroTCA and other architectures.
Carrier cards that accept PMCs are usually made in the Eurocard format, which includes single, double and triple-height VMEbus cards, CompactPCI (cPCI) cards and more recently, VPX cards.