Following the Government’s instruction regarding the national coronavirus emergency, Starrett UK closed on the 24th March until further notice. We look forward to continuing trade when possible to do so. All orders placed on and after this date will unfortunately not be shipped. If you would like to continue with your order we will have it delivered as soon as restrictions are lifted and it is safe to do so. If you have any questions at all please fill in an enquiry form on our contact us page - but in the meantime, stay safe everyone.

S829EZ - Full Ball

S831EZ - Half Ball With Flat Bottom

These small hole gauges are well balanced tools, ideal for accurately measuring small holes, slots, grooves and recesses in all kinds of work. Accurate measurements are obtained by slightly "rocking" these gauges in the hole to be measured. This will guarantee contact at the true diameter. The final size is then obtained by measuring over the ball contacts with a micrometer.

  • Hardened-ball measuring surface with two-point contact.
  • Radius on each gauge is less than the minimum diameter to be measured, which provides the two-point contact necessary for maximum accuracy.
  • Smooth, sensitive adjustment for better feel, giving more accurate measurements.
  • The adjustment of the gauge beyond their range is restricted by a safety stop that prevents breakage.