Well-suited for all users, our Gatorline Trimmer Line features long-lasting, high-quality materials and fits most standard trimmer heads. 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. Impact resistant – Gatorline is made from a Nylon co-polymer that is fortified with additives so it lasts longer and breaks less Round trimmer line – the most popular trimmer line shape. Offers effective cutting for a range of applications. More durable and longer lasting than square trimmer line .065" diameter trimmer line is good for battery powered trimmers as smaller diameter trimmer line decreases drag and demands less power from your trimmer Fits many popular string trimmer models including, but not limited to: Worx GT Revolution WG170 and WG163, Black and Decker LST136 and LSTE523 and Greenworks 21332 GatorlineTM home-use line goes the distance and stays resistant when trimming in tough conditions.