German Auto Solutions M52tu-M54 Cam Chain Tensioner Tool Precision CNC machined from aircraftcraft grade aluminum and cold formed steel. Same Cam Chain Tensioner Tool that comes in our M54 Pro Cam Timing Kit. Tensioner body is anodized for wear resistance. Tensioner screw is black oxide coated to prevent rust. 100% Designed & Manufactured in the USA. Limited Lifetime Warranty.