Trimmer Head Bump Knob / Stihl 4004 710 4000Pack Size:1Stihl 4004 710 4000, Stihl 4002 710 4000NHC 207-3587Stihl FS36, 40, 55, 66, 72, 76, 81, 86, 96 and 106 1.792" OD x 1" HT