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The K at the end of an Advantys STB module part number indicates that it's a kit that includes the base and both the appropriate screw and spring type connectors. In some cases, the part number may have a KS or KC, these will include only the screw (KS) or spring type (KC) connectors in addition to the base. The part number for the NIM network interface modules will not have the K, but they will include the screw and spring type connectors required.