I have had this set for 6 months now and am very happy with its performance! No problems with this collet chuck and collets. The runout was only 0.0001, which is less than specified. Am very happy with this set for the money. will buy again. Someone noticed that the ring was poorly machined in the collet, but they didn't realize that it had to be off-center to engage the collet! I don't think you should comment if you don't know what you're talking about!