"I knew this cart was gonna be heavy-duty the moment it was delivered. The box was heavier than any other cart I've ever received. Once I got it in my shop and unpacked it my initial impression was verified. All of the individual pieces were exceptionally heavy and well made. I didn't assemble it according to instructions - I installed the shelves upside down so that each shelve had a lip around the edge to insure that items would not fall off. Not really sure why they manufactured it with the intent of the shelves being install so that they were just flat with no lip. Installed that was, it would be exceptionally easy for items to fall off. At any rate you can install the shelves either way. I used a impact driver to install the bolts and I over tightened one bolt which broke. Not a big deal but if you do use an impact driver be advised that you can break the bolts. After assembling I tested the cart out by placing a toolbox filled with all my 1/2" sockets, ratchets, adapters, etc on the top shelve at an edge and seeing if the cart was still steady. It passed the test with flying colors and was steady as a rock, would not tip regardless of what I did. Two casters are lockable and hold the cart in place when desired. Great finish on all parts, no scratches, dents, etc. I'm probably gonna customize the cart by adding a handle on the end where the locking casters are located. Best cart I've ever used. Highly recommended for those who want quality products." - Review posted on Homedepot.com