Speaking of impact drilling I noticed the utility company using a Milwaukee impact to drill holes in poles for mounting transformer and guy wires. I was curious about size bit and model of impact but missed my chance to get a close look. Gave me the idea to take a 3/4” spade bit along with my Surge impact into the attic where I was attaching junction boxes and some 2x4 bracing. With the 3/4” bit in my pocket I drilled holes through the top plate for wires.
Moral of the story, I only needed the Surge impact to do all those jobs. Small light weight tool and some bits, and no kickback to throw me off balance while pearched on a joist. But I don’t think it would drive a big hole saw.
They are likely using the same impact I do. It's a 7/16 hex drive version of the 1/2" high torque - detuned to like 550 ftlbs. We use Milwaukee shockwave ship auger bits. 7/16 hex drive, 11/16 x 18". They are honestly the best bits I've ever used. It's the only thing I have ordered now. Mikwaukee does make small length ship auger bits too, (not shockwave) but I'm not certain if they are 1/4" hex drive to use on a standard impact driver. I would think they would be, but I really don't remember - I could be wrong.
The 11/16" auger bit is used for 5/8 bolts. 13/16" bits used for 3/4" bolts - but those seem to be more and more uncommon these days. 3/4" bolts were only used on really heavy (lead, or large modern) copper phone lines. Nobody is really putting those up anymore. I can't see the local power company needing anything bigger than 5/8 bolts either.
I bribed a vendor years ago when mikwaukee first came out with that impact. Now companies are finally starting to buy those over their $2,000 corded models or hydraulic options.
Actually the standard bell system corded impact is a 5/8 hex drive. I think Milwaukee and IR are the only people still making that. It's hard to find nutrunners for that, and they aren't cheap.. 7/16 has become much more standard these days. All the hydraulic guns are 7/16 hex, I don't think they even make a quick chuck in 5/8 on those.