Economy version of the classic handlebar used on English 3-speeds.
These have a longer straight section (185 mm), making them more compatible with modern brake levers and grips. The standard 1" diameter clamp area is compatible with most stems, and is heavily knurled to prevent slippage.
Note: Some Nottingham Raleighs ( 1950s - 1960s) have a 15/16" handlebar clamp diameter. If you're replacing the handlebar on one, you should really replace the stem too, because it is unsafe to overspread the 15/16" stem to fit a standard 1" (25.4 mm) handlebar.