L.S. Starrett Company 267 - Taper Gauge, 1/16 to 1-1/16", 1/64", Steel   267

.010-.150"/0.3-4mm
The gage is made of quality tool steel 7/16" wide by 6-1/4" long and is accurately tapered throughout its entire length for quick and convenient measuring of slot widths, etc.
One side is graduated from .010" to .150" in thousandths of an inch and the reverse side from 0.3mm to 4mm in one twentieth of a mm (0.05mm)