Whether you just design or manufacture mechanical parts or work on your tractor in the field, this range can quickly become your best friend. This range allows you to choose the size of the bolt and temporarily replace a lost bolt on a piece of equipment. While I haven't personally used it yet, I know how valuable this set can be. I recently made a crane attachment that I installed on the forks of my tractor. I already had a couple of universal pins that helped me determine which bolts, nuts, and washers to use for final assembly. By the way, the faucet works fine. Today we completed the last of 13 rows of blocks in our 28x56 log home.