for Ego Trimmers: This Ego 3660582001 compression spring is seamlessly compatible with models including ST1500, ST1500-S, ST1500F, ST1500SF, ST1500XY, ST1510S, ST1510T, ST1520, ST1520S, ST1530, and STA1500, enhancing the performance and of your 15inch string trimmers. Compatibility Alert: Note that older ST1500F or ST1500SF trimmers might feature an AH1500 head, requiring a 3660650001 spring. Check if your trimmer head displays green lines for alignment to confirm if this replacement spring is suitable for your device. Versatile Replacement Option: Besides a wide multiple Ego trimmers, the 3660582001 spring also fits various Ego AH series heads like AH1300, AH1520, AH1522, AH1530 & AH1531. A single solution that catches all your needs for Ego trimmer heads maintenance. and Resilient: Manufactured with , the spring replacement spring maintains excellent elasticity. It effectively regains its shape even after extensive use, assuring you of its durability and reliability in keeping your trimmer in optimal working condition., Weight: 0.07495716908 pounds, Manufacturer: Aisuoka