Manufactured from same special alloy steel used for Gauge blocks so as to achieve the finest properties. Bars are offered in 22mm and 12mm diameter in steps of 25mm. Bars of 12mm dia. can be used as Micrometer Setting Standards. IS 7014 / BS 5317 standards in metric BS 1790 in imperial Metric & Imperial Reference, Calibration, Inspection & Workshop Grade 25mm to 1000mm – standard sets Custom sizes upto 1000mm Steel