The climbing chain was a tool carried by Hewkii when he was a Toa Inika.1, 2 One end was attached to Hewkii's back, and the other was attached near the handle of his laser axe. The chain was useful for rock climbing.3
The climbing chain materialized inside Hewkii's Toa canister when the Red Star transformed him into a Toa Inika.4, 5, note 1 Presumably, it later transformed into the electrified chains when the Mask of Life transformed Hewkii into a Toa Mahri.6