100% Hit Chance
Deals 197 Mechanical damage and calls in a bombing run.
After 3 rounds the bombs will arrive, dealing 394 Mechanical damage to the current enemy pet.
Drop: Siegecrafter Blackfuse [??+]
Zone: Siege of Orgrimmar
Approximate Drop Rate: 1 in 125
World Event: Darkmoon Faire (first week of each month)
Zone: Darkmoon Island
Cost: 90 (unlimited supply)
Drop: Darkmoon Game Prize
Approximate Drop Rate: 1 in 1,670
Profession: Engineering 
Taught By: Engineering Trainers