The EGO AH1520 POWERLOAD String Trimmer Head is an authentic replacement part designed exclusively for EGO POWERLOAD string trimmers. This innovative head incorporates POWERLOAD Technology, enabling automatic winding of the trimmer line for effortless operation. Constructed with a durable aluminum head, it comes pre-wound with professional-grade 2.4mm (0.095-inch) twisted+ trimmer line, ensuring robust performance and longevity. It is compatible with various EGO POWERLOAD string trimmer models, including ST1520S, ST1520, ST1521S, ST1511T, ST1500SF, ST1500F, ST1500S, ST1500, and STX3800.