There's 6 different sets. I bought the 37 piece set last time and really, there's no better buying online or B&M for $7. I've also used an impact driver on a few of them and they stood up. You should not do this as they are supposedly not impact rated.
There's also a few drill accessories available + a $79 brushless hammer driver with a man sized 13mm chuck.
I do find these sell out quick.