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Other letters are often tagged onto the end of Stihl string trimmer model numbers, such as E, M, R, C, and X. One example comes from the homeowner string trimmer group, the Stihl FS 56 RC-E Trimmer.

Commercial landscapers use the speed-feed head, which is quicker in installing the line, Boyer said. Larry Davis, president of West Farm Equipment in Sheffield said there are many sizes or trimmers.