Add the 18 in. VersaTop Work Surface to the top of two Ready-to-Assemble Steel Modular GearBoxes to create a versatile garage work center. Go a step further by adding two Steel Modular GearBox Caster Kits for a mobile workstation. The 56.4 inches long x 17.7 inches deep x 1.42 inches thick work surface sets into place on two Ready-to-Assemble Modular GearBoxes. Rated load 600 pounds per unit, based on lab test of 2,400 pounds for the work surface supported by two Gladiator Ready-to-Assemble Modular GearBoxes. It can hold an engine block. Medium density fiberboard creates a durable and solid work surface for garage projects.