Proto makes them. This is one but they have them shorter, flex in common drive sizes. I have one it is made by Facom, its good, they also have some in the Blackhawk line and possibly others.
I a 1/4" from the 60's that belonged to my grandfather and one that I bought about a year ago. Same part numbers and quality aside from some changes in surface finish and worn off chrome.
SK has them with the new double tooth ratchet. 1/4", 3/8",1/2" drive and also the standard tooth count with a 3/8" drive in a 1/4" ratchet. Very high quality. Made in the U.S.A.