OM2-1522-2 Large Diameter Hi-Lok Protrusion Gauge Black Markings. Large Diameter Hi-Lok Protrusion Gauge Black Markings Set of 5 protrusion gauges for nominal diameter Hi-Lok® and Hi-Tigue® fasteners, sizes: 7/16”, 1/2”, 9/16”, 5/8”, and 3/4”.

Measuring 1.8” square, these gauges are easy to handle and provide plenty of reach to inspect larger fasteners. .020” full hard stainless steel insures long gauge life.

Large footprint helps stabilize gauge against work surface.