I will say that I have not used them yet, but I have checked them with calipers and they have all adjusted the diameter and length. They're definitely made out of solid birch, so they feel strong. I even counted them to make sure I got all 175 and 183 instead. (Double Check) so it's nice to know they're packing in a few extras just in case. If you are looking for lots of 3/8 dowels this is the best set I could find. Not as cheap as buying from a wholesale site that sells 1,000 packs for over $20, but much better than buying from Lowes who only sell 18-packs for $3.