I own about a half-dozen different brands of utility knives and this Craftsman set it by far the best brand I have. I hate having to replace the blades on a utility knives and it seems some knives should come with an instruction manual to replace. These knives are very easy to replace and seem to stay sharp longer than other brands. I've used these on every type of project, from cutting carpet and linoleum to cutting boxes. They are made out of stainless steel so they won't rust or corrode. I know this for a fact because I accidentally left the larger knife out in the winter elements for a couple of days and was surprised that it didn't have any rust on it when I finally found it. I buy the Craftsman blade online because as I said before the Craftsman blades do stay sharper longer than other brand of blades I have purchase. They stay locked and I haven't had any problems with them slipping like other utility knives have done. I highly recommend these if you're looking for quality utility knives.