I do a lot of mechanical work on the side, and I have always been a long time believer in using high quality tools for the job. Craftsman tools have always been known for making professional tools, and their 230 piece Mechanics Tool Set is no exception. In this set you will get virtually every socket, wrench, and key you could ever possibly need for your job. You will find both standard and metric systems, and all the typical sizes found in the industry. These tools are very well made, and will withstand a good amount of force. Like with all Craftsman professional tools, these tools come with a lifetime warranty. This basically means that if it breaks, Craftsman will replace it for free. I have used this wrench set on many different projects, and have yet to see any of them show any sign of wear. Whether you are a professional mechanic, or just a garage tinkerer, the Craftsman wrench set is a must.