2 9/16'' x 10'' for British Duplex lamps

2 9/16'' x 10'' ROUND BULGE for Brit Duplex lamps.

2.585'' base diameter, 3 1/2'' round bulge. Flame cut ends that virtually eliminate end ''flaking'' or ''flea bites.'' High quality chimney. 

Also fits some pre-1900 American lamps listed as requiring 2 5/8'' base chimneys. (Limit three chimneys per order/per package.