Holes in gauges allow easy identification of component sizes

Suitable for use to identify bolts, fittings, pipe and spark plug sizes

Metric: Thread size – 2.5– 22mm , thread pitch – 0.45–2.5mm

USS (Small): Thread size – 1/4” – 3/8” , thread pitch – 16–44 TPI

USS (Large): Thread size – 1/16”–1/2”,10–18mm , thread pitch – 10–28 TPI,1.00, 1.25, 1.50 (mm),14, 18, 27 (TPI)