Weed II heavy-duty replaces bump-and-feed trimmer heads. Fits medium duty and commercial grade curved and straight shaft trimmers. Easy-to-install, no tools required. Excellent for tall grass and heavy weeds. Fits most Ryobi, McCulloch, Toro, Homelite, and Echo gas models. For specific model assistance call CMD Products, 800/210-9949. Refer to model No. 4610 (SKU 700054) for replacement blade.