This replacement grass trimmer line spool set is designed for Worx weed eaters. Featuring an auto-feed system, the replacement spool eliminates the need for hand-winding. The spool uses centrifugal force to feed the trimmer line as needed. High-quality 10FT / 3.1M weed eater edger line easily cuts through grass and weeds. Durable and tough, it is resistant to breaking and ideal for garden mowing. Safety tips: Always wear eye protection. Unplug the tool before changing, installing, or removing accessories. Choking hazard—small parts. Keep away from children under 3 years. Suitable only for trimming grass. For tough and strong weeds, use blades to trim. Not compatible with any other string trimmers. Specifications: Type: Trimmer spool For model: WA0010 Spool material: 70% nylon + 30% glass fiber Grass rope material: Nylon Spool line size: 4 x 1.8 cm / 1.57 x 0.71 inch Spool line weight: 15g Spool length: 3.1m x 1.65mm Compatible with Worx models: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180 Package included: 20 x Spool line 2 x Cap cover