Quality gauges are used for quick and accurate measurements of inside diameters of holes and widths of slots from which micrometer measurements are taken. Constructed of heat-treated tool steel. Self-centering action ensures accuracy. Long-handle design for improved reach into deep holes or slots. Satin chrome finish. Includes six sizes: 5/16 to 1/2'', 1/2 to 1-1/4'', 1-1/4 to 2-1/8'', 2-1/8 to 3-1/2'', 3-1/2 to 6''.