Both concave and convex radius gages become a pair
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With a locking clamp
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The Mitutoyo 186-101 Radius Gage has the following technical specifications: Range: 1/32"-1/4" Accuracy: +/- 0.002" Composition of Leaves: 15 pairs: 1/32"-1/4" by 64ths Remarks: 180-degree arc
