Steel Rule, Precision, Rustless, Rigid , Metric.
Marked two sides on four edges, square ends, graduated mm, 1/2mm figured every 10mm in mm.
Stanley 64R Rustless Rule 600mm / 24in STA135402
An Engineers, precision, rigid steel, rustless rule, metric/imperial on 2 sides, 4 edges.
Imperial side is graduated to 16ths, 32nds, 64ths, 10ths, 20ths, 50ths, 100ths.
Metric side is graduated to 0.5 mm.
Class 1 rule.
Length. 600mm (24 in)