Screw Pitch Gage, Metric 28 Leaves, Starrett

Starrett metric screw pitch gage with 28 leaves. Measures 60° threads from 0.25 mm to 2.50 mm.
Leave Sizes: .25, .30, .35, .40, .45, .50, .55, .60, .65, .70, .75, .80, .85, .90 millimeters
Leave Sizes: 1.00, 1.10, 1.20, 1.25, 1.30, 1.40, 1.50, 1.60, 1.70, 1.75, 1.80, 1.90, 2.00, 2.50 millimeters
Starrett screw pitch gages are among the most useful tools in any mechanic's toolbox. They quickly determine the pitch of various threads. These gages consist of a substantial steel case with a number of folding leaves at both ends, each leaf having teeth corresponding to a definite pitch, marked on each leaf. Starrett screw pitch gages are available in a wide range of sizes with different numbers of leaves in various pitch ranges with which to gage. The screw pitch gage features a locking device at both ends of the case, so leaves can be securely locked in position for use. Leaves have a special narrow design, permitting checking internal threads in nuts, etc., as well as external threads.
Starrett catalog number 156M.