My first metric socket set was an S-K set (45+ yrs ago).
I don't recall any missing sizes.

That's funny, my first metric socket set was S-K brand too. They were the
first tools I bought when I started driving. I think I may still have one
or two of those sockets left. They were fairly good quality compared to the
cheap bargain store sockets my step-dad always bought.

Most of my hand tools now are Craftsman's that I've had for 30 years or
more.

Anthony Watson
www.watsondiy.com
www.mountainsoftware.com