The Box Breaker is an item in Going Commando and Size Matters. It is an OmniWrench attachment manufactured on planet Oozla, which allows Ratchet to destroy all boxes and breakable objects in his vicinity by performing a hyper-strike and slamming his OmniWrench on the ground.
In Going Commando, the Box Breaker can be obtained by returning to planet Oozla with the Gravity Boots obtained, ascending a grav-ramp within the store, sliding down a pipe, and defeating the Swamp Monster II. In Size Matters, it can be purchased from a Gadgetron vendor.
The Box Breaker's functionality was later included with the Bolt Grabber V2 in Up Your Arsenal. In Tools of Destruction and A Crack in Time, the Box Basher 2000 can be obtained, which has the same functionality.
In Ratchet and Clank (2016), it can be obtained on planet Gaspar after collecting all the telepathapus brains and turning them in to the scientist.