The M18 FUEL QUIK-LOK String Trimmer Attachment is powered by the M18 FUEL Power Head with QUIK-LOK (sold separately) and is compatible with the QUIK-LOK attachment system. The String Trimmer Attachment features an adjustable cutting swath: Set it to 14" for maximizing runtime or 16" for clearing a wide area. With its easy load trimmer head, this trimmer delivers a line loading experience that's quick and painless. In addition, the head holds up to 25' of trimmer line. Like all QUIK-LOK attachments, this trimmer features protected drive shafts for increased durability against drops and storage elements. The String Trimmer Attachment also utilizes optimized gearing to manage the cordless M18 FUEL Power Head RPM output specifically for string trimming applications.