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A simple set of discs for checking the pitch of screw threads, particularly useful when trying to identify threaded items like bolts and setscrews. With these you are able to identify popular unified fine and course threads, metric and pipe threads. A bonus for vehicle mechanics is a spark plug thread gauge. Every workshop should have one of these along with the Zeus Reference Book, the popular small pocket booklet that is the reference book for fitters, metalworkers and draughtsmen.