385-284 Speed Feed 375 Trimmer Head Replaces Shindaiwa: 78890-11000, 78890-18000, 999442-00902 Fits most straight shaft string trimmers manufactured by Husqvarna, Red Max, Shindaiwa and Stihl (Recommended for straight shaft trimmers under 25cc) Arbor sizes included: 10mm x 1.25 LHF Spool holds about 10' of .095" line Uses .080", .095" or .105" diameter line (Includes 10' of .095" trimmer line) Uses 385-055 Trimmer Head Spool Uses 385-058 Trimmer Head Spring Cap Uses 385-062 Trimmer Head Spring Uses 385-070 Trimmer Head Eyelet This is a Stens replacement part Part Number 385-284 This is an aftermarket of generic part