The Faithfull FAIPITCHMW Screw pitch gauge with a combination of 52 Whitworth standard 55 degree and Metric standard 60 degree leaves per gauge (0.25 to 6.0mm). The leaves are clearly etched with the size and are used to determine the pitch of various Metric and Whitworth threads. Manufactured from high-quality polished tool steel and featuring a locking device at both ends to securely lock the leaves FAIPITCHMW