Smooth, jeweled lever action Positive reversing switch Hard chrome-plated ratchet contact point Half-shaded yellow for clarity Interchangeable contact tips For precise measurements in all machining, layout, and inspection work.Includes:(3) Contact PointsBody ClampUniversal Friction Holder w/ShankUniversal Shank Complete w/Long & Short ArmDouble Jointed AttachmentHeight Gage AttachmentSurface Gage AttachmentCoupling