This doesn't make sense to me - the 3/8 impact sets for shallow and deep sockets are 8-19, 21, 24mm sockets and the trays only come with posts 6-20mm
Ordered this Gearwrench tray set for ~$25 from Home Depot last week. I like it except for the fact that the 22mm shallow and deep sockets do not fit properly (other 22 mm sockets with thinner walls fit fine). Gonna pick up a 1/2 set from Snap-on figuring they will have enough clearance for the thicker wall on their own impact sockets. Need to grab a 3-row 3/8 tray since I also have a set of semi-deep sockets.