Mower Parts Group (10) Pack Stihl 25-2 Replacement Bump Feed Trimmer Head fits FS44 FS55 FS80 FS83 FS85 FS86 FS88 10 Pack Bump Feed Trimmer Heads with line and Optional Arbors/Adaptors Arbor sizes: 10mm x 1.0 LHF; 10mm x 1.25 LHF Uses .080" .095" or .105" line Fits Most Straight Shaft Trimmers. Echo, RedMax, Husqvarna, Stihl Slotted eyelets. Split Spool. No Loose Parts. See Description for full details