Abstract: To facilitate the insertion of printed-circuit boards into a holder whose sidewalls form guide tracks for these boards and whose bottom has contacts engageable by terminal tabs on the boards, as well as the extraction of such boards from the holder, a C-frame adapted to span the holder surrounds a slider having a pair of lugs which point to the interior of the holder when the frame legs come to rest on its sidewalls and which carry hooks fitting into holes of a printed-circuit board lying in the plane of the frame. The slider is biased by leaf springs into an extended position, defined by stops on the frame legs, in which it can be locked by a latch during an insertion operation. For extracting an inserted printed-circuit board from the holder, the slider is unlocked and is then squeezed against the ridge of the frame resting against the holder walls to disengage the terminal tabs from their contacts before fully withdrawing the board.