This S3D precision-engineered shock height spring preload setting tool is (Compatible with Losi 1/12 rc cars) and a must-have for RC enthusiasts and racers. The fan-style design features multiple gauge measurements including 3mm, 2mm, 1mm, 0.75mm, 0.5mm, and 0.25mm, allowing for precise shock spring preload adjustments. The durable construction includes a pivoting mechanism that lets you quickly select different measurement sizes. Color-coded gauges make it easy to identify and select the right measurement for your setup. This specialized tool helps achieve consistent suspension performance across your RC vehicle, ensuring optimal handling characteristics. Perfect for both trackside tuning and workshop maintenance, this tool simplifies the process of achieving exact shock spring preload settings for competitive racing conditions.