Abstract: An adjustable rack system has a column with a plurality of teardrop shaped slots and a beam having a connecting bracket that connects the beam to the column. The connecting bracket can be an L-shaped bracket with a recessed portion in one of the legs of the L. A plurality of connectors extend from the surface of the bracket and are adapted for insertion into a large upper portion of the teardrop shaped slots and then moved downward to the bottom portion of the teardrop shaped slots. A locking pin is provided that extends through an opening in the recessed portion and is movable between an extended position where the locking pin projects beyond the recessed portion and a retracted position where the locking pin does not project beyond the recessed portion. A spring is coupled to the locking pin and can be located at least partially within the indentation.