These solid brass oil lamp collars are all #2 size, with a threaded opening of 1-3/16" i.d. The bottom diameter (the part that fits down over the glass neck of the lamp) is 1-11/16" across on the plain & fluted band collars; and 1-7/8" on the press on collar.

#2 plain	3.25
#2 plain,antiqued	3.50
#2 press-on	3.50
#2 fluted band	3.50
	#2 NICKEL plated solid brass plain collar	3.50