1. 10T Gear HeadEquipped with 10 teeth, this gear head is designed to fit most straightshaft trimmers. It features a 4mm diameter shaft with a square connection hole, compatible with various models. 2. MaterialMade from aluminum alloy, this gear head boasts a solid structure and durability. It delivers stable performance for longterm use in various gardening tasks. 3. Easy InstallationWith its lightweight design, this gear head mounts effortlessly onto the trimmer. It allows for the replacement of both blade forks and trimmer heads, making it a practical option for trimmer gear replacement. 4. Wide CompatibilityThis gear head is specifically designed for gardening and is compatible with various models, including FSKM, FS75, FS85, FS91, FS110, FS120, FS130, FS131, FS200, FS230, FS240, FS250, FS260, FS410, and more. Please verify compatibility with your trimmer gear head before ordering.