Thank you for posting. Can you go to shop.snapon.com and confirm that ?1/4" Drive 12-Point SAE 9/16" Flank Drive? Deep Flare Nut Crowfoot Wrench? item number AN85089B is the same tool you?re describing?
The description in your, ?Snap On 1/4" drive 9/16" 12 pt crow foot Flare Nut? does not include the words, ?Flank Drive? Deep Flare?.
At the cost of $37 each I better be certain before buying.
Also, does the tool remain on the nut? Is it trapped somehow.
Thanks again for posting.