Anytime Tools Test Dial Indicator 0.0005" 0-15-0 and Universal Holder Quill Clamp For Bridgeport Mill Machine Clamping Diameter 1-7/8" Test Indicator 0.0005" 0-15-0 included Clamping Diameter 1-7/8" . Length from clamping bracket to indicator 4-1/2" Reach from 0-12" diameter Suitable for all indicators with DOVETAIL or 5/32" shank (stud) Adapts immediately for positive and fast indicating