Stanley 64FR flexible engineers 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 0.5mm.
Class 1 rule.
Length. 300mm (12 in)
Width 12.5 mm
Thickness 0.45 mm