I needed a 7/8 X14 tpi tap to clean the threads on my bike. I checked the internet and found that prices vary. When I found this set for sale at Revain I bought it as it was included for the same price I found the faucets for. A few clicks and the goods are ordered and paid for. I received it within the time frame he said. When I received it I used it immediately. Clean the thread easily without much effort. I have yet to use the matrix but if I do I'm sure it will get the job done.