The problem with binders is not only is there a difference in width & thickness of the binding,there's also a difference in what people want to bind canvas,leather,carpet meaning the binder has to be made for the material thickness so there really isn't a standard binder that will work esp for leather .If your really want it to work properly (which most people do) it's best to call an attachment maker like Tennessee Attachment or Atlanta Attachment & you tell them the make & model of your machine & they'll want a sample of your binding & leather & let them know if it needs to go through any seams & they'll make you one that'll work.