1.material:high carbon chrome steel 2..diameter:2.381mm-25.4mm 3.certificate:ISO9001:2008 4. ... Lot Diameter Variation(μm)Ra(μm)101/16”~1”0.250.250.500.025281/16”~1”0.70.71.400.050401/16”~1”1.001 ... .002.000.080601/16”~1”1.501.503.000.0951001/16”~1”2.502.505.000. ... RangeGauge Interval(μm)Preferred Gauge(μm)101/16”~1”1-10,…..,-1,0,+1,…..,+9281/16”~1”2.00-12,…..,-2,0,+2,…..,+12401/ ...