Open-deck stack rack bases have cross stringers that support loads with firm, flat bottoms. The large open spaces between the cross stringers allow air to circulate through the deck for ventilation. Compatible posts fit into the bases to support additional rack levels and protect items on the racks from being crushed when stacking multiple racks vertically. Forklifts can pick up the racks from any side.

Wood-deck stack rack bases support loads with uneven or irregularly shaped bottoms, such as bags or tires. They consist of wood planks that sit on top of cross stringers, which support the planks when loads are placed on the deck. Compatible posts fit into the bases to support additional rack levels and protect items on the racks from being crushed when stacking multiple racks vertically. Forklifts can pick up the racks from any side.

Modular four-post stack racks each consist of four posts that are welded to a base, and they do not require assembly. The top of the racks' posts insert into sockets on additional bases to create a multilevel storage system. The posts protect items on the racks from being crushed when stacking multiple racks vertically. Multiple racks can also be placed side-by-side to accommodate pipe, tubing, extrusions, and other long items.

U-rack stack racks each feature a single U-shaped frame that cradles items on the racks and protects items on the racks from being crushed when stacking multiple racks vertically. All parts of the frame are welded together, so the racks do not require assembly. Multiple racks can be stacked vertically to create a multilevel storage system, and they can also be placed side-by-side to support pipe, tubing, extrusions, and other long items.