Yeah, these little DC units are very handy. I've used them before on many prototyping efforts, and they fit snugly onto a "solder-less prototyping breadboard/(insertion board)". All the ones that I have are now in use, on various projects/experiments, so I bought another 20 of them & they're pretty good value purchased in this number. They arrived today & they look pretty good. These should keep me busy for a while ? Great ... Thanks :-)