SPI 14-223-2 Back Plunger Dial Drop Indicator: 0 to 0.1 inch Range, 0-100 Dial Reading, 0.001" Graduations, 1-35/64" Diameter Dial, 0.1" per Revolution. Back plunger indicators offer flexibility to toolroom and general-purpose machining and inspection applications. The compact size and perpendicular design can be adjusted to fit any viewing angle. Built to ANSI standards, this gage is supplied with jeweled bearings for extra-smooth action and long life. Heat-treated stainless steel racks, gears, and pivots. 1-piece forged brass case with chrome plated finish. Scratch resistant non-glare cyrstal. Stem diameter is 1/4 inch.