Size 5/16 - 1/2". Double action (self-centering) contact point ends are made of hardened tool steel and precision ground on a radius of the smallest hole the gauge will enter. 1 lbs (0.5Kg) shipping weight.
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Size 1/2"-3/4". Double action (self-centering) contact point ends are made of hardened tool steel and precision ground on a radius of the smallest hole the gauge will enter.