- 12-24 threaded front and rear, with numbered spaces - Channels constructed from 3/16” aluminum - Heavy duty base includes holes for securing to floor - Black powder coat finish - Includes 50 pieces of 12-24 threaded rack screws - Ships flat to save space The industry standard RLA Series two post open frame rack incorporates a 15” deep heavy-duty aluminum base and includes holes so that the rack can be secured to the floor. 12-24 threaded front and rear, with numbered rackspace increments. Includes 50 rack screws.