B&P Lamp Screw On #2 Collar, Brass Plated - B&P Lamp Screw on #2 collar, brass plated, Screw on No. 2 size collar screws onto most all glass lamps with threaded glass 1 5/8" Outside Diameter neck opening, Made for BandP #12621 and 12665 burners, Has 1 11/16" Inside Diameter base and 1 3/16" Inside Diameter top, Brass plated,. Features Include: Screw on #2 collar, brass plated, Screw on No. 2 size collar screws onto most all glass lamps with threaded glass 1 5/8" Outside Diam, Made for BandP #12621 and 12665 burners Has 1 11/16" Inside Diameter base and 1 3/16" Inside Diame