HHIP Inch & Metric Thread Detective Identifiers. Nut and bolt thread identifiers. Each size has a nut and bolt checker on the same gauge. Thread sizes are etched on each gauge. The individual gauges rotate freely on the wire cable for fast thread verification. Gages are on a convenient wire cable with a loop to hang on a hook. The inch nut and bolt sizes on the first cable include #6-32, #8-32, #10-32, #10-24, 1/4-28, 1/4-20, 5/16-24, 5/16-18, 3/8-24, 3/8-16, 7/16-20, 7/16-14, 1/2-20 & 1/2-13. The metric nut and bolt sizes on the second cable include M4 x 0.7, M5 x 0.8, M6 x 1.0, M7 x 1.0, M8 x 1.0, M8 x 1.25, M10 x 1.0, M10 x 1.25, M10 x 1.50, M12 x 1.25, M12 x 1.50 & M12 x 1.75.