2 pack Universal Weed Eater Head for Echo SRM Trimmers

This universal string trimmer head fits Echo SRM straight shaft trimmers. It replaces Speed Feed 400 375 Bump Feed Trimmer Head. The trimmer head diameter is 3-3/4", and the bolt size is M10 x1.25 mm. It also fits Shiandaiwa String Trimmer models C230, C242, C2510, F18, F20, F21, F222, F230, F195, T195s, T220, T222, T230, T231, T230s, T242, C242, T242X, T2510, C2510, T2510X, C3410, T3410, C260, T260, T261, T261B, T261XR, T261XB, T270, T272, T272X, T282, C282, T300, T3410, T3410X, T350, BP35, B45, B450, C350, T235, T344, C344, T254, C254, and Echo Weed Eater