Armstrong Helicoil kit in plastic case.
For 5/16" by 18TPI BSW (Whit)

Nice item, not had much use.

Complete as shown, the drill is 8.2mm close to the size stated but 0.1mm down.
(Not the 21/64" that is written on case)

Two taps one has been used and does have a chip on the flute.
Both are a plug tap so on harder materials will need some care.

Lots of coils as shown looks to be 1D and 2D.

Case is fine, red tray does have a crack as shown.