Businesses have found add-on boltless shelving to be a simple solution to increase storage space. This metal racking simply attaches to existing starter units to extend their length. Connects easily to existingstarter unitfor more storage space Open access to contents from all sides Made of 14-gauge, powder-coated steel Levels easily adjust on 1-1/2" centers Optional 5/8" thick particle board decking Configurable with casters (sold separatelyhere) To ensure rivets are properly set on posts, firmly tap beams with arubber mallet. Availability:Stocked in our warehouse. Ships next business day.