As a ford tech, I use snap on 7, 8, 10, 13 mm 1/4 deep impact sockets, 13 and 15 deep well Cornwell 1/4 magnet, 7, 8, and 10 mm snap on 1/4 impact swivels, 10 mm impact snap on short 1/4, Matco 19/21mm tire flip socket with 3 inch extension, 13 and 15 mm snap on 3/8 impact swivel mid-length, 13, 15, 18, and 21 snap on impact 3/8 deep.
This tray works perfect in my roll cart for quick commonly used sockets. I have been running this print for over 6 years.