This part is commonly Used on models:
51831 Flex-Force Power System 13in or 15in 60V MAX String Trimmer
51831T Flex-Force Power System 13in or 15in 60V MAX String Trimmer
51834 Flex-Force Power System 11in or 13in 60V MAX String Trimmer
51834T Flex-Force Power System 11in or 13in 60V MAX String Trimmer
