The quality of the shelf tubes is very good. I was building shelves with a laser level and couldn't figure out why my shelves weren't level. I disassembled the tubes twice and finally figured out the reason for the crooked shelves - the tubes weren't the same length. I had to buy two boxes, one 12" and the other 11.5". I was able to get them to work with a combination of the two sizes. So here's the lesson you should learn: Measure your pipes to determine the right size and consistency. I am returning a second box with a combination of two sizes. I give the tube 5 stars for quality and 0 stars for consistency.
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