They sure are proud of their tools, but they do offer shanks that I haven't seen before. Personally, I use a speed chuck from Lowes or Home Depot and buy the short set of nut runners from Harbor Freight. The speed chuck that comes with the set of 4" nut runners isn't worth throwing at a dog (not that I would do that)
This is CABL.com posting #340435. Tiny Link: cabl.co/mbAI3