Specifications: 
- #1-to-#00: Outer thread = 7/8", inner thread = 5/8"; allows a Nutmeg or Acorn burner to be threaded into a lamp having a #1 collar.
Out of stock, no longer being made
- #2-to-#1: Outer thread: 1-3/16", inner thread - 7/8"; allows a #1 burner to be threaded into a lamp having a #2 collar.
Out of stock, no longer being made
- #3-to-#2: Outer thread: 1-13/16", inner thread: 1-3/16"; allows a #2 burner to be threaded into a lamp having a #3 collar. Out of stock, no longer being made

