The recipes for all three pieces can be bought from the blacksmithing vendor behind the forge in Shadowmoon Village in Shadowmoon Valley.

The plans can also be found in Telredor the town up in the trees in Zangar Marsh from the armorsmith as well.

This is actually a good tanking set... just put w/e u need... stamina or def rating... anything... its good for both classes rlly

The set will cost you:
26  Adamantite Bars;
9  Primal Earth;
6  Primal Fire;
2  Knothide Leather.