Parameter: Product Name: Spring Balancer Load range: 15-22KG /22-30KG Working stroke: 1.6M Wire rope diameter: 5MM Wire rope length: 1.5M Shell material: Aluminum Tower wheel material: Aluminum Weight: 7.13KG Features: 1. Thickened alloy cover, anti-wear and durable 2. High precision aluminum alloy tower wheel 3. Alloy steel hook 4. Locked safety buckle 5. Anti-collision buffer design 6. Adjusting bolt design 7. Self-locking device design Note: Load 1-200KG can be customized, if you need other load ranges, please contact customer service.