P1300-PART-13-KEY Hydrant Key

will this work on a zurn 56069-1 wall hydrant? My 7/16 socket works but not my 3/8 socket which is too small

what is the key made of ?

Is the key itself narrow enough to fit inside a 5/8" valve casing? My 3/8" valve lock under my sink is enclosed inside a casing 5/8" wide.

Can anyone post any pics of the key itself?