Renolds half link for Norton Primary Chain. First and foremost, I would say it is not considered good practice to fit half (or one and a half) links to primary chains. However, if you find that fitting a different toothed sprocket leaves you with a difficult range of adjustment, then this half link may be used - at least until normal chain stretch allows for it to be removed. Note: these are half links . . . which are quite unusual. It is more usual to fit a 'link and a half' which we also sell seperately. However, these are available if a link and half will result in too long a chain.