Abstract: A frame for mounting electrical and electronic equipment has its horizontal and vertical members connected together at each corner by identical corner blocks with three wings at right angles to one another, with which the ends of the members are telescopically engaged and to which they are bolted. Racks are provided for mounting equipment or for trays or shelves in a number of positions. At each corner of the frame a vertical rod passes through holes in the top and corner blocks and a screw nut is engaged with the top of the rod for lifting the frame without damage or distortion.