These are practice putting gates.  4.25 inches is the hole side down to 2.5 inches which is just barely big enough for the ball.  These are great to help you practice accurate putting at home.

Feet are designed to be glued on.

Printed in PLA for indoor use.  If you wish to use them outside in the summer I would suggest using a higher temp material.

STL files available so you can modify for your specific needs.

Gate Feet Version 2 added.  These have tighter tolerances on the holes for a tighter fit with the gates so no glue should be needed but is still recommended.

Gates with Spikes added for outdoor use on practice greens for use before a round or for training.