Triton 1" Dial Indicator 0.001" Graduation Travel Lug Back White Face Our part # ALL-52000 Measuring range: 0-1" and reading: 0-100. Lug back. Stem diameter: 3/8"; and dial diameter: 2" Manufactured according to ASME/ANSI standards Rack and contact point made of hardened stainless steel. Jeweled movement..