6 Inch Rule

with imperial and metric scales - perfect size to hang on a magnet on your lathe headstock.

Stainless Steel Ruler and Metal Rule Kit with Conversion Table (Silver, 6 Inch

Unknown purpose. Perhaps optician?

Specialty Boxwood 6 Inch Rule with Integral Hook Mint - 108719

Rules

Crescent 6 ft. Wood Rule Brass Extends X46SLN - The Home Depot

File:Faber Castell 6 inch slide rule.JPG - Wikipedia

Starrett 6 inch Precision Hook Rule

Pocket Ruler - Paolini Pocket Rule - Woodpeckers

Pacific Arc Pica 1/32nd & 1/64th Stainless Steel Ruler w/Non-Slip Back 6

Big Horn 6-Inch Precision 16R Rigid Stainless-Steel Ruler - (1/50 Inch, 1/100 Inch, 1/32 Inch, 1/64 Inch) 19589

The 6-Inch Rule for Fruit Trees

6 Inches Stainless Steel Pocket Rule Handy Ruler With Inch 1/32 Inches Mm/metric Graduations - Feeler Gauges - AliExpress

Stainless Steel 6-inch Rule – HouseMade Industrial

c1890 bone & German silver 6-inch folding rule

6 Inch Steel Ruler, Starrett Ruler

150mm Steel Ruler - Metric & Imperial Markings - Hanging Hole - 6 Inch Rule