Length gauges of cylindrical bar type in four grades of accuracy; reference, calibration, inspection, workshop. Accuracy for sizes up to 48 in and metric sizes up to 1200 mm in all grades; two types of screwed connection, one a refined type developed by NPL for inspection bars. Design and accuracy for accessories used with workshop bars. Sets of inspection and workshop bars.Cross References:BS 84BS 888BS 1133:Section 6BS 1133:Section 19