Plungers Or Ball Of Gauge Expand From The Center, Under Spring Tension To The Size Of The Hole Being Measured, Then Locked In Place With Knurled Knob

Final Hole Size Is Determined By Measuring Over The Contact Points With A Micrometer Or Dial Caliper

Gauging Surface Is A Full Round With A Flat Bottom, Permitting Use In Shallow Holes Or Slots 

Rigid Handle With Double Action (Self Centering) Feature For Quick Checking Of Inside Bores

Satin Chrome Finish

Constant Spring Tension For Uniform Feel And Contact Pressures

More Measuring Tools

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