Stanley 64R 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.
Lengths available: 150mm (6 in) or 300mm (12 in)
