Abstract: An attachment for a fork-lift truck has a vertical support plate, secured to an adjacent lifting plate of the truck and laterally shiftable therealong by a fluidic jack, which is provided with two pairs of vertically spaced, horizontal guide rails slidably engaged by complementarily profiled pairs of mounting rails which are rigid with two outer prongs shiftable relatively to the support plate by two further jacks. Two inner prongs frictionally engage the mounting rails of the respectively adjoining outer prongs for lateral entrainment thereby between limits defined by adjustable stops on the support plate.