In 3/8 drive chrome, SK doesn't make semi deep or mid length sockets.
SK sells deep and extra deep 3/8 drive chrome sockets.
Their deep sockets vary in length by size. For example, 6 through 13 mm are 1.75 inches long overall, 14 & 15 mm are 1.86 inches long, and 16 through 19 mm are 2.5 inches long.
SK's extra deep sockets vary by size but, not as much. In extra deep 7 mm through 15 mm are 2.14 inches long, 16 mm - 20 mm are 2.5 inches long, 21 & 22 mm come in at 2.75 inches long, and 23-26 mm measure 2.82 inches long.
There are similar size breaks in their SAE sizes too.
When you talk about SK 1/2 drive semi deep sockets, you've lost me. I don't think SK makes Semi deep anything in 1/2 drive. Their 1/2 drive metric deep sockets run 3.25 inches long overall, and their 1/2 drive chrome shallow metric sockets run from 1.46 to 1.72 inches long overall.
I'm not sure what you're looking for.