This power equips Rayman’s fists with metal jaws. You can use
them to cling on to metal grabs. In combat, they cling on to the enemy. When this happens, press Space Bar or Left Mouse Button to give the enemy electric shocks.—Manual (PC version), Rayman 3
First acquired mid-way through the second level of Clearleaf Forest, the LockJaw is provided by the blue Laser-Washing Powder and allows Rayman to protrude a pair of bear trap-like devices from metal handles attached to his hands. This gives him the ability to grab onto flying hooks, which serve the same purpose as flying rings from the original Rayman game and Purple Lums from Rayman 2.
Offensively, the LockJaw can also inflict damage on several types of Hoodlums by having its metal jaws latch onto them and then further attacking them with electric shocks, allowing for a lengthy, long distance attack. However, the LockJaw is not able to latch onto all enemies, such as the Lavomatrixes, in which case it behaves like Rayman's typical telescopic fist. Most notably, the power-up is essential during the first phase of the final Reflux battle, as the constant stream of electric shocks that Rayman is able to deliver via the LockJaw is required to destroy Reflux's shield in order to allow Rayman to attack. It lasts 49 seconds, making it the longest lasting power.
When Rayman acquires this power, his hair, body and the tops of his shoes turn blue, while his hood, gloves, and the soles of his shoes turn green. The ring on his clothing and the red buttons on his shoes also turn yellow.