Description: 1. This set can be used to assemble the trimming heads of most lawn mowers. 2. You can replace the trimming head you want at any time and it can be reused. 3. The method of use is also very simple. Features: -Designed to attach different types of blades to your mower, it fits most straight-shaft trimmer models. -You can replace the trimmer head you want at any time and it can be reused. -Suitable for Husqvarna or Stihl weed trimmers: Stihl FS55R, FS56R, FS36, Sarlo SS-18, FS81, FS80, FS81, FS85, FS90, FS100, FS110, FS120, FS200, FS250 and more. Specification: .