Material: 65 manganese steel heat treatment, no rust, long service life.
Gauge range (Inch): 1/8"-1/5",1/5"-3/10",3/10"-2/5",2/5"-1/2".
Gauge range (mm): 3mm-5mm,5mm-7.5mm,7.5-10mm,10-13mm.
Extra long for gauging deep and shallow holes, slots and similar work.
Used for comparison measurement of bore diameter and groove width.
br> Method of Use: For small holes, slits and grooves of the measurement, insert gage into small bore and
turn knurled knob to expand, remove from bore and measure with micrometers or calipers.