These are new old stock. Unused. These are USA made from the early 1980s. I have a few cases of each left. Sizes are below. Here you are getting 10 3/8 Drive sockets, and 10 1/2" Drive sockets.
This is a set of 20 sockets total. Exactly as pictured. These sockets fit standard and metric without issue.
Made In USA Designed by the Metrinch Tool Company in St. Paul, Minnesota in the 1980s Items are New & Sealed, New Old Stock (The packaging may have shelf wear from weight of sockets and age) Sockets are 12 Points: 6 Points SAE Standard & 6 Points Metric These are NOT the modern style Metrinch sockets which are high-priced, made in Taiwan, and based on a 6 point (or lobe) design.
Manufactured by National Hand Tool in Texas.
3/8" Drive : 3/4"x19mm 11/16"x17mm 5/8"x16mm 19/32"x15mm 9/16"x14mm 1/2"x13mm 15/32"x12mm 7/16"x11mm 3/8"10mm & a 5/8"x16mm Spark Plug Socket
1/2" Drive : 7/16-11mm, 1/2-13mm, 9/16-14mm, 5/8-16mm, 11/16-17mm, 3/4-19mm, 13/16-21mm, 7/8-22mm, 15/16-24mm, 1-25mm