Starrett 650MB1 Dial Indicator with Deep Hole Attachment, 9.5mm Stem Dia., Back Plunger, Yellow Dial, 0-100 Reading, 43mm Dial Dia., 0-5mm Range, 5mm Graduation Smooth and accurate operation due to their sturdy, basic design Hardened, stainless steel AGD stem diameter Adjustable dials to set zero at any point opposite the hand Inch reading dials have white faces and millimeter reading dials are yellow Three different styles of contact points are furnished with each indicator