The Park Tool Stool Backrest STL-3K is an upgrade for the STL-1.2 Shop Stool, enhancing comfort and support for long work sessions. It includes a sturdy backrest, two steel support bars, and all necessary fasteners for easy installation. Designed specifically for the STL-1.2 model, it ensures a secure fit and improved ergonomics, ideal for mechanics or DIY enthusiasts aiming to optimize their workspace. SKU: 255410.