SPI Dial Thickness Gage Designed to measure parts single handed by using handle and lifting lever. Features include... 0-0.5" Measuring Range 0.0001" Graduations Easy to use retractable handle offers quick and efficient inspiration. Hardened stainless steel spindle. Flat contact points. Dial diameter: 2 1/4" Throat depth: 1 1/8" ONLY 1 Unit available at this price!