The casters make the RTA units seem more sturdy. Before this, they were beneath my 8 foot bench; they seemed flimsy with the stationary feet, so much that I was considering selling them. Now I will keep them for as long as they'll last!!!!
With the wheels they dont fit under the bench anymore; however, I still highly recommend these if you have the RTA cabs. During assembly you do have to remove the bottom panel and flip it for the casters to fit.
Even at $20 I wish I found these for less!
RTA Casters retail price on sale: usually around $38-40.
Lowes Clearance Price: $20.
Approx. 50% off retail sale prices.