Centre bars to fit the new style Petzl Lynx, Dart, Dartwin, Sarke and Vasak crampons.
The Vasak and the Sarken have a special double slot system whereby the Long Bar can be shortened meaning the Long Bar can be fitted to these models whatever your boot size.
Centre bars for older models of Petzl/Charlet crampons (see photo) are no longer available and are slightly different. Unfortunately these new one won't fit (but they may do with a bit of filing, though it would invalidate any warranty and as a Petzl dealer we can't recommend it!)
NB They do not fit Petzl Irvis Crampons - for these use Petzl Flex Link Bars.