Hi Ed
What you have here is the Veritas Offset Wheel guages available from Lee Valley
The five smaller guages are available as a set ( item 05N64.01 ) which include 1/4", 5/16", 3/8", 7/16" & 1/2" raduis offset and the 4 larger ones are sold individually 5/8", 3/4", 7/8" & 1" raduis offset ( items 05N64.05, 05N64.06, 05N64.07 & 05N64.08 )
The wheeled guages are used to draw a parallel line around a pattern of any shape or size or to inlarge a template. The wheel is used by simply inserting a pencil into the center hole and follow your pattern perimeter to produce an enlarge tracing of the actual item.
Ric
