Aero-Flex Universal upgrade kit with Glider fits virtually all gas and these battery brands: De Walt (20-Volt to 40-Volt), Echo, Craftsman (20-Volt to 40-Volt) Ryobi 18-Volt, Expandit 40-Volt, Milwaukee, Makita. Optional Glider makes trimmer a mower. Easily remove glider if you wish. Use glider on battery trimmers to increase run time 50%. Features: Precut Lines. Fits Models: https://aero-flex.com/pages/installation. Number of Lines: 4. Returnable: 90-Day. Trimmer Part Type: Fixed Line Trimmer Head. Product Depth (in.): 3.5 in. Product Height (in.): 11.0 in. Product Width (in.): 7.125 in. Trimmer Part Type: Fixed Line Trimmer Head