This is the EXTREMELY rare Shimano TL-FH10 Dura-Ace 7400 freehub removal tool from the 1980s/early '90s. Only 3-5 of these come up on e-bay every year and they sell for $60-100 each for what is essentially a SINGLE BOLT.
Not only did I upload the stl, I also included a .step file, a PDF engineering drawing, and the original FreeCAD files so you can get this machined from metal if you so desire.
The author marked this model as their own original creation.