A little late to the party. The heavy duty Rubbermaid carts have three sets of holes in the legs. These holes are the perfect size for 1/2" emt to fit through, and 1/2" emt is the perfect size axle for wire spools to fit on. The picture doesn't show it but the holes run both directions. Also, there are two sizes of carts and both have the same features. A less expensive cart could have 3/4" holes drilled in the legs to accomplish the same thing. I have a 15 and a 24 spool cart so I've never set my Rubbermaid up with spools, but it's always an option. The carts also have notches in the top that make for a good saw horse for cutting conduit. Unfortunately for me, my cart usually has too much **** piled on it to cut anything, but I can attest that the notches work well.