Bomb Crank

A Bomb Crank, also known as Bomb Arm or Big Bomb, is a recurring item in the Final Fantasy series.

Final Fantasy III
The Bomb Arm item casts Firaga.

Final Fantasy IV
Called Big Bomb, but called Bomb Crank in the DS release.

Final Fantasy IV: The After Years
Bomb Crank deals a Fira attack to a target. It is found in Ceodore's Tale in Baron Castle East Tower 1F and Mist Cave B1, Kain's Tale in Mist, Rydia's Tale in Dwarven Castle West Tower and Sealed Cave B2, Yang's Tale in Adamant Isles - Forest Part 4, Palom's Tale: Challenge Dungeon Flan Floor, Porom's Tale in Mist, Edward's Tale in Underground Waterway Entrance North B1.

Bomb Cranks can be bought in Challenge Dungeon Merchant's Square 2F. It is also a possible final treasure in Challenge Dungeons.

Bomb Cranks are dropped by Bomb King, Chimera, Chimera Brain, Flamehound.

Final Fantasy VII
The Right Arm inflicts heavy non-elemental damage to all enemies.

Final Fantasy XI
Bomb Arm (alongside the related Snoll Arm and Cluster Arm) are used as crafting materials.

Final Fantasy XII: Revenant Wings
The Bomb Crank is a scavenging item and is used in several of Ashe's hand-bombs. It is the High Rank of the Volatile Compound series of materials.