Last summer I ordered Keysmart – both a regular size and an EXT size, with extension posts, so that I could try them with my keys. I built something similar, and was interested to see how a commercial product based on the same design would look.
And they look great. Unfortunately the size posts they use don’t work with most of my keys. Here are 4 keys off my ring, 3 of which have “too small” holes. In their defense, they did provide 2 SC1 blanks with larger holes, however my Schlage key isn’t a standard SC1, so unfortunately, no dice.
The thing I find kinda amazing is that they market this as something a janitor could use. Most commercial janitors probably have Sargent, Primus, or Best keys to carry (I don’t have any Best keys around right now, so I can’t test those – but I don’t think they were much larger than the Sargent).
I really hope they offer smaller posts that could be swapped in, otherwise I’m going to have to find some novelty use for two tools that could have been really useful in daily life!