• Same as Which Trimmer Head Models: Trimmer head replacement number compatible with Echo Speed feed 400, 99944200907B
• Which Weed Wacker Model are Compatible: Compatible with Echo SRM-210, SRM-225, SRM-225i, SRM-225U, SRM-230, SRM-266, SRM-266T, SRM-280, SRM-280T, SRM-2620, SRM-2620T, SRM-2620U, SRM-2320T, PAS-225, PAS-230, PAS-266, PAS-280
• Which Weed Wacker Model are Compatible: Fits for Shindaiwa T226S, T251, T262XS, T262TXS, C226S, C251, C262S, C262TS, C280TS, T302TS, C302TS. Also fit for RedMax BC220DL, BC221DL, BC300DL, BC2300DL, BC17, BC23, BC32, BK235FL, BK345FL, BK435FL, BK530DL. If your brand or model is not listed, compare the existing mounting hardware on your model with the ECHO mounting bolts and/or bushes to determine the correct parts required
• Head Size: Bolt Size: M10 x 1.25LH(Only this bolt is equipped); Overall Width: 4-1/4"; Overall Height: 2-9/16"; Pre-loaded with 13-ft of .105-in string, compatible string's diameter: .065", .080", .095", .105", or .120"
• Performance Crush: material upgrade brings good quality. As we all know, the weed eater head rubs against the ground at high speed, the temperature rises and it is susceptible to wear. Our upgraded trimmer head is made from nylon and glass fibre material, which improves heat resistance, wear resistance and hardness by 30% to 40%, resulting in a longer service life. This is a significant improvement in performance over other plastic weed eater heads in use.
• No Disassembly for Loading and Easy Feeding: Simply insert the line and turn the knob to reload the line in less than 30 seconds (no kinks in the winding process). And when it's time to feed, a light tap on the head extends the line without stopping and making manual adjustments. Designed for lawn care professionals to provide reliable convenience.