Cutter
This is a replacement cutter for a grinding wheel dresser. It was backlit while sitting atop of a chainsaw scabbard.
Grinding dressers are used to return a grinding wheel to its original round shape (to true it up), to expose fresh grains for renewed cutting action (including cleaning away clogged areas), or to make a different profile (cross-sectional shape) on the wheel's edge.
Wikipedia
Image, including background, is 1 1/2 inches top to bottom.
Cutter
This is a replacement cutter for a grinding wheel dresser. It was backlit while sitting atop of a chainsaw scabbard.
Grinding dressers are used to return a grinding wheel to its original round shape (to true it up), to expose fresh grains for renewed cutting action (including cleaning away clogged areas), or to make a different profile (cross-sectional shape) on the wheel's edge.
Wikipedia
Image, including background, is 1 1/2 inches top to bottom.