Heavy Armor Kit

A Heavy Armor Kit is attached to armor to increase the item's armor value.

Source
Heavy Armor Kit is crafted by Leatherworkers with a skill level of 150.

The pattern is taught by the Leatherworking Trainer.

Heavy Armor Kit as a Quest Objective

 * Turn in 8 Heavy Armor Kits, 8 Rugged Armor Kits, and Logistics Task Briefing VII to Janela Stouthammer
 * Turn in 8 Heavy Armor Kits, 8 Rugged Armor Kits, and Logistics Task Briefing VII to Merok Longstride