Amstron interchangeable drop-in inserts for the 6 bank universal chargers. These inserts are designed for OEM battery part numbers KNB14, KNB15, KNB16, KNB17, KNB20, KNB21, KNB22, PB43N. For use with Kenwood TK280, TK380, TK290, TK390, TK480 and more.