I have to correct a couple of statements here. Challenger was never a New Britain line -- it belonged to Plomb/Proto/Pendleton long before they came together as Stanley subsidiaries. It originally was a trademark of Penens if Alloy Artifacts is correct, and I think it is.
As Cruiser808 mentions, the thin beams are often handy in situations of poor access, but they are susceptible to bending...I have one or two which suffered that.
The history of New Britain after Litton acquired them does not seem to be available on the web, and since Northrop Grumman acquired Litton, even Litton's history is becoming obscure. (Litton acquired New Britain in the conglomerate frenzy era of the 1960s, but their definition of "synergy" was a little too broad. Another long story.) However, I'm pretty sure that New Britain was not part of Stanley until at least the late 1980s, based on comments from someone who worked at Stanley in New Britain, Connecticut, in those days.
Cheers,
Hank