That's a decent adapter. And I was pleased to find this selection of 
Yankee-style bits hidden away on their site:

h
ttp://www.leevalley.com/en/Wood/page.aspx?p=66021&cat=1,43411,43417

I keep three Yankees with Robertson Nos 1, 2 & 3 under my bench at all 
times.

Don

On 5/18/2014 6:26 AM, William Ghio wrote:
> I keep buckets of Robinson heads is various sizes in the shop. They get driven
w/ a light brace and a Lee Valley adaptor: "Our hex driver has a 1/4" hex socket
with a rare-earth magnet in it to firmly hold any standard 1/4" bit – Phillips,
square-drive, posi-drive, etcetera."http://www.leevalley.com/en/wood/pa
ge.aspx?p=32300&cat=1,180,42337">http://www.leevalley.com/en/wood/page.aspx?p=32
300&cat=1,180,42337