"Wild_Bill" wrote:


I prefer to use an air impact wrench, and for small/medium fasteners, the
3/8" drive was very satisfying to use. I don't know that a 3/8" impact
wrench would operate the punch very well though.

The 3/8 impact would be a better choice. I've used one before for holes in this range.
Had no problem with the typical hoffman box.

Wes