Abstract: An arrangement to provide a card cage of an electronic system with a retaining bar. The retaining bar simply and quickly latches in to holes drilled in the side of the card cage. Similarly, the retaining bar quickly unlatches from its holes to provide access for maintenance personnel. The retaining bar has a spring loaded latch element at each end of its length. It has a bar member with a U-shaped cross section in order to prevent excessive bending in the middle. The retaining bar further has a layer of resilient material between the U-shaped bar member and the printed wiring cards to provide a force against each card to retain it in its respective card position. The resilient material may be highly insulating or it may be anti-static as the technology requires.