I have only seen those wrenches in a seven piece set that Cripe sells for $10 (one of the best $10 you'll spend by the way).
They're nice wrenches with good chrome, fit, finish, and feel.
My only complaint is that I could never find a 16/17/19mm wrench to round out the set. Oh well.
Skin nailed the manufacturer as Gearwrench as the set (#90933) is made in Taiwan by Danaher Tool Group Sparks, MD 21152. Which present day Gearwrench calls home but, before there was the infamous Apex tool group was formed.
This set was made for a short period of time when NAPA professional tools went from being US made Armstrong/KD/Allen clones to clones of Gearwrench tools, and before NAPA launched their current Carlyle line.
Below are pictures of the seven piece set with its wrench holder, and a comparison to the US made NAPA professional series 11mm wrench and the Gearwrench clone.