Teclock Dial Indicator Features Include... Thread size: #4-48, metric 2.5 x .045. Meets or exceeds federal specifications. Easy reading dial with crisp graduations. Interchangeable hardened chrome point. Hard satin-chrome finish. Hard chrome plated stem, precision ground and tapped. Technical Data.. Measuring Range: 0.250" Dial Reading: 0-50-0 Graduation: 0.001" Dial Diameter: 2 11/64" AGD: 2 Revolution Counter: No Dial Color: White Back Type: Flat