DGOL Full Ball Small Hole Gage Range 1 8 inch 1 2 inch 4 pcs Telescoping Bore Gauge

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.