Kwik-Chek Hole Gages are designed for the rapid measurement of small plain or counter-sunk hole diameters. The four models available cover a range of hole diameters from 0.010" to 0.380" or from .25mm to 9.50mm. These gages work on the principle of directly transferring diameter measurements from a sliding tapered needle to a linear readout graduated in 0.001" or 0.02mm. These highly versatile gages are especially suitable for measuring small holes in sheet metal, plastics, printed circuit boards, fuel injection nozzles and thin-wall tubing.