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.
Size 2-1/8"-3-1/2". 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.
With the innovative design this ratchet is like having two. With it's contoured handle and only a 5 degree swing of the handle to operate this ratchet is ready for those tight working areas.