Product details:

Adjustable thread ring gage, no go, class 2a, thread size 2-56, unc, material tool steel, outside dia. 1 In, overall thickness 1/4 in, thread length 5/32 in, tolerance class x, includes certificate of accuracy traceable to nist adjustable thread ring gagesuse to inspect externally threaded product to assure assembly of mating parts and to verify min./max. Pitch dia. Limits. Sae gages meet asme b1.2 Standards. Metric gages meet asme b1. 16m standards. Class 2a and 6g class x thread gage tolerance tool steel construction.