High quality replacement trim compatible with Stihl Autocut FS44, FS55, FS56, FS65-4, FS70, FS80, FS83, FS85, FS90, FS91, FS94, FS100, FS110, FS111, FS120, FS130, FS131, FS200, FS240, FS250, FS260, FS260R.Replacement cutting head number: 4002 710 2137 / 4002 710 2169, diameter: approximately 15 cm, lower threaded hole size: 10 x 1.25 mm.The replacement cutting head features a special double-wire design for cutting and trimming. The nylon line is adjusted by tapping the cutting head on the ground.Designed for use with a 2.4 mm nylon line. Easy to install and use.Size is measured manually; please allow a 1-3 cm measurement error. Due to differences in lighting and display screens, slight color variations may occur. Actual product may vary slightly in color and appearance.If you have any concerns upon receiving the item, please contact the seller directly before leaving feedback. Thank you for your understanding.