I have a big craftsman socket set & hf trays. 2 sizes I remember not having a place are short 21mm 3/8 & 9mm 1/2. I don't need the 9 for anything & put the 21 on the 20 post because I've never used a 20. I've been looking at other socket storage recently & if you like having them organized with the size displayed... most hold the same sizes except westling & that's $100 plus a couple bucks per tray for size engraving & shipping for a set. You'll probably need 2 with sae & metric. I'd give a hf set a try. You can always use them for less used sockets
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