Shank for the #9 Inversion Shank Assembly. It is available in 450 or 600mm shank lengths.
The inversion shank is designed to lift soil from the bottom of the working depth up toward the surface. It disrupts soil layering and intermixes the soil structure while still fracturing and aerating the soil structure.
See the full shank assembly with part numbers 024-1001 (450mm) and 024-1002 (600mm).