Well-suited for all users, our Gatorline Trimmer Line features long-lasting, high-quality materials and fits most standard trimmer heads. .65" diameter trimmer line is an ideal fit for many string trimmer models, including but not limited to: Worx GT Revolution WG170 and WG163, Black and Decker LST136 and LSTE523 and Greenworks 21332. Gatorline is compatible with most standard trimmer heads including fixed-line, semi and automatic bump-feed heads. Additionally, it fits most gas, electric, and battery-powered curved and straight shaft string trimmers. Check your string trimmer manual for recommendations and to ensure that larger lines will work with your trimmer.