UPDATE: Changed rounded edges to chamfers to improve print quality.  Also I have added a 2"x2" version by request, but I have not personally tested the 2x2 fit.
 

Hooks that attach to compact utility tractor Roll-Over Protection System (ROPS), for carrying long-handled tools like shovels, weed-eaters, etc.

This is designed to fit a 1x3" ROPS

The hook interior is 1.5"

Recommend adding rubber washers between the 2 pieces to prevent slipping