Starrett 272MB Millimeter Reading Fillet or Radius Gauge, 5.5 - 13mm Range, 0.5mm Increment, 16 Leaves

An external and internal radius on each leaf permits both concave and convex surfaces to be measured. The leaves is specially shaped for use in any position at any angle to measure fillets and radii in corners or against shoulders. Each leaf is stamped with the radius size and has an eccentric mounting for clearance between the leaf and the case when the gauge is opened.