I usually write I don't write reviews but was pleased to see what I got at such a low price. Excellent quality for the money, but the accuracy of some bits is very poor. Some of them are bigger and some are smaller. I would definitely recommend this set if you don't need high precision or have time to get a better piece when it comes and your required size is inaccurate. However, if you need high accuracy for say an axle rod or bushing, do yourself a favor and order a larger end crown, which is known for its accuracy. I measured all bits with calipers certified and calibrated by Mitutoyo. There are some holes in the photo. Some bits are 0.5mm smaller than they should be and some are 0.3mm larger. I drilled a few holes and they were pretty clean and better than I expected for the price. I didn't see any burn marks on either the wood or the blades. How long they last, who knows, and at this price, who cares. If they are correct, I would buy a new set at this price in no time if I needed them.