While it’s not the easiest thing to do this Rock Ripper Auger bit sure does make it easier! I highly recommend this auger bit if you need any sort of holes drilled into concrete. Rock Ripper Auger Bits
Looking for a low profile, narrow hitch post hole digger designed specifically for compact and subcompact tractors then look no further. Everything Attachments has the Compact Tractor Post Hole Digger for you. 44 HP gearbox with a strong tubular boom.
The Everything Attachments 6900 HD Tractor Post Hole Digger is made with a strong tubular boom. This Tractor Post Hole Digger is made for the full size and larger compact tractors, to use with up to 18″ diameter augers. Rated for up to 57 HP.