579 Series-Series S579HZ Telescopic Bore Gauge, Telescopic Bore Gauge, 5/16 to 6″, 8 to 150mm, Number of Pieces: 6

S579HZ TELESCOPING GAGE SET: (6) NOS. 5 Precision ground radius on each gauge provides two-point contact for maximum accuracy Constant spring tension gives uniform contact pressure Both plungers are easily locked at any desired setting Handles are rigidly attached to the contact plungers and are automatically self-centering Ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gauge will enter Include two telescoping arms and case