Trimmer Treads: Weed Trimmer Wheels-Attachment Dolly for String Trimmers, Weed Eaters, and the Like Trimmer Treads fits most any size weed trimmer shaft! Trimmer Treads goes on in ten seconds without the use of any tools! Trimmer Treads works on gas and electric trimmers with curved or straight shafts! Trimmer Treads helps prevent arm, shoulder, and back Pain! Trimmer Treads is great for smooth terrain and small areas where lawn mowers can't reach!