This is a fine, hard to find size, solid brass Expanding Collar to expand the burner opening size from a #2 opening to a #3 burner opening.
Measures 3/16 inches tall, 1&1/4 inches wide outside threads for the #2 burner, and 1&13/16 inches wide inside threads for the #3 burner opening.
A lot of the early oil lamps with a #2 collar, look even nicer with a #3 burner and this is a great way to make your #3 burner fit your #2 oil lamp collar.
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