The Faithfull FAIPITCHMA Screw Pitch Gauge is a handy gauge that quickly determines the pitch of various screw threads. The high-quality polished tool steel leaves are clearly marked with size and there is a locking device at both ends to securely lock the leaves. AMERICAN NATIONAL 60 Degree Threads - 4-42 tpi METRIC 60 Degree Threads - 0.25-6.0mm