The exclusive Tap-N-Go IV replacement trimmer head. This Weed Eater accessory is designed to fit most weed eater models such as XT25/65/200, YM200/600, F'Lite/F'Lite Plus/F'Lite SST & FL20. 5/16" RH Tap-N-Go IV Replacement trimmer head, Fits Model#s: XT25/65/200, YM200/600, F'Lite/F'Lite Plus/F'Lite SST & FL20