Where nomenclature for Model No. NX1KSM50XXXXXXR is as follow: N = 5, which represents international sales or marketing code X1 Optional = May be provided for Plug Type Designator Location XXXXXX = up to 6 alphanumeric characters, which represents the features, distributor code, and/or color, bundle attachments, plug type and optional pouring shield R = Optional digit 0 to 9, which represents changes that does not affect the construction or safety of the product