17mm 3/8" Flank Drive Socket. Ex Aviation Surplus. High Quality. These sockets are very likely Snap-On Industrial Grade but they have no numbers to confirm this even they are from a Snap-on industrial package. This is common in Aviation. Branded as Zemo as they where supplied in Zemo bags.(Zemo make tooling for Snap-On's Industrial Range.)

Lots of other sizes and tooling available, too many to list on Ebay. Inc Torq-Set, Tri-Wing, Philips, Flat Head and Torx. All Aviation Grade. Please visit our shop or message for more details. 

Sold Loose. May show light marks from extended shelf life. 1/2" drive also available.