Sturdy, well made rails...Superior castors. move well and are very floor friendly.
However, the problem I encountered involved the M6 bolts. Several were too short to use easily, making it difficult to install the wheels. ( Bolts were all the same length, but the fit of the pieces seemed off a mm or two )
I would suggest slightly longer M6 bolts.
I use my unit to store and make several hundred vinyl records easily available in a limited space.

Product is first rate. Just what my washer needed. Just need to get my transfer of dolly deck from ramp to hold in position to dolly truck transfer over too easy care mobile Spacecare washer dolly. Rubber furniture feet cannot hold dolly deck in place. There are no locks on dolly deck casters to hold lift of truck and washer to spacecare dolly. Used wood bocks before to do this. Well now look for 2 x 4 or 2x 6 ramp and or deck aid.

Small frig..havent used it to much but now I can move it my self..

This stand works well, but I wouldn't count on it holding items that weigh more than, say, 300 pounds -- or less, if the base will be wider than 24 inches in any direction.

Here are some assembly tips I learned through trial and error. They might be obvious to the mechanically inclined, but I don't include myself in that esteemed company.

1. Ideally you should use your own tools, NOT the included "wrenches." You'll need a socket wrench with 10mm and 13mm sockets, a 10mm wrench and a 13 mm wrench -- preferably box-end wrenches.

2. Arrange the four corner pieces in a rectangle so each set of 4 holes for the swivel wheels are aligned the same way. I don't know if this is important, but symmetry can't hurt.

3. Gather the 16 small bolts and matching nuts. The washers should stay close to the head of the bolt; you don't want to reposition them against the nuts.

4. Decide which swivel wheel you'll attach to each corner. It seems best to keep the two lockable wheels on one side, rather than in opposite corners.

5. You are going to bolt the the swivel wheels to the corner pieces BEFORE you connect the corners to the long metal pieces. This will save a lot of aggravation. Hold each nut inside the corner piece; place the bolt through the swivel base and corner piece, and loosely thread the bolt into the nut. Don't tighten the nuts until you have all four bolts threaded into their nuts. This is the hardest part of the job, as it can take a lot of maneuvering to keep all four of the very short bolts aligned.

6. Once you've connected a swivel to its corner piece, with all four bolts threaded loosely through their nuts, use the 10mm socket wrench to tighten each bolt head, while holding its nut with the wrench. Don't over-tighten, or you might bend a washer. You only need to tighten enough that the lock washer is flattened. Repeat this for each corner and its swivel.

7. Now that you've joined each corner to its swivel, connect them with the long metal pieces, using the 8 larger nuts and bolts. The bolts are inserted from the outside, with the nuts towards the inside. This is much easier than the previous two steps.

8. Slide the corners and the long connectors to fit the item you will place into the stand. Measure carefully, then tighten all eight large bolts, using the 13mm socket and wrench. You now might want to install the four orange corner stickers; I think this is optional.

Good luck!

Placed my Workmate on the frame and can roll all around my shop. Seems well made, sturdy and the front wheels lock. The wheel locks are not the greatest but they do the job for me.