Signswise Trimmer Head for Stihl Autocut Go 25-2 FS 44, FS55, FS56, KM 55, KM 56, KM 85, KM 90, KM 110, KM 130 Easy to reload trimmer line. Uses a 25-2 blade type. NOT an original Stihl trimmer head. Standard diameter of 0.095-inch Comes with a bonus spark plug. Product diameter 12cm, Weight:0.4Kg, This trimmer head is an aftermarket replacement for the Stihl Autocut 25-2, 4002 710 2191, and 4002 713 9608. It is NOT an original Stihl trimmer head. Please kindly note this before your purchase.