The Armor Magnetizer is an item in Going Commando, Tools of Destruction and A Crack in Time, as well as a gadget in Before the Nexus. It increases the magnetic field strength of armor, and allows the user to attract bolts from much further away than usual.
In Going Commando, the MegaCorp Armor Magnetizer is provided to Ratchet on planet Todano by Stuart Zurgo, a rabid Qwark fanboy, in exchange for the Captain Qwark action figure (purchased on Aranos from the Plumber). In Tools of Destruction, it can be found on Ardolis after completing the Heli-Pod training. In A Crack in Time, it is a reward on the Agorian Battleplex.
In Before the Nexus, the Armor Magnetizer is a gadget which, when activated, allows bolts to be picked up for its duration. The duration can be extended by purchasing upgrades to the gadget.