Screw Thread Grinding Gauge
Thread gauge of ground steel, 3 pieces, with ground measuring faces and labelled cut-outs.

Product Specification
Vee-form threads: 55deg-60deg
Square threads: 2-8 turns/inch
Metric threads: 60deg
Whitworth threads: 55deg
Trapezoidal threads: 30deg
Pitch range: 2-12 mm
Contents: 3 pieces