Horex-Radius-Gauge-Set-1-7mm-Horex-2616-166-The-Horex-Radius-Gauge-Set-1-7mm-is-a-penknife-style-tool-with-radius-gauges-that-have-been-designed-for-checking-both-internal-&-external-radii-Manufactured-with-special-steel-&-equipped-with-a-screw-nut-Horex-Radius-Gauge-Set-1-0-7-0mm