QualityParts From Oregon That you can depend on. Impact resistant – Gatorline is made from a Nylon co-polymer that is fortified with additives so it lasts longer and breaks less: Square trimmer line – Slices through vegetation with a clean, even pass; .155" diameter trimmer line is ideal for professionals cutting tough vegetation and underbrush. Check your user manual for maximum diameter fit-up; Fits several string trimmer models including, but not limited to: Remington RM1159; ; ; Oregon Equipment Parts 21-055 Gatorline Square .155 5Lb Spo