★★package: 1set x Flexible Shaft Trimmer Attachment+ 3 teech blade+ 1 x line trimmer head ★★The anti rotation positioning point of the product is on the right side of the user. Please purchase and have a careful look ★★,Lightweight trimmer attachment : Designed with a lightweight feel with heavy-duty aluminum. Perfect for replacing worn out lower booms. ★★ 34-inch extended reach: Straight shaft added reach makes it easier to trim under bushes, around fencing, and in hard-to-reach places. ★★ Fixed line head: Makes loading line quick and easy by using pre-cut, easy to insert cutting line. Reload and regroup in no time. ★★ The cutting direction of the product turns left Compatibility: Fits Attachment capable units from Ryobi, Greenworks, Remington, Craftsman, Yard Machines, Troy-Bilt, Yardman, Snapper, Bolens, Murray, Kobalt and most other major brands.Powerhead coupler accepts 1 inch AL diameter tube Drive shaft connector: Square shape .205” Female Attachment drive shaft: Square shape .200” across flats. Based on the product information, this string trimmer attachment is compatible with several brands besides Ryobi. The bullet points mention that it fits attachment capable units from Greenworks, Remington, Craftsman, Yard Machines, Troy-Bilt, Yardman, Snapper, Bolens, Murray, Kobalt and most other major brands. A customer question also asks if it fits Echo products, to which the answer suggests checking the interface size for compatibility.