Swivel Knives are Forgotten Leatherworking Assets that can be acquired as necessary components for completion of a number of rare Forgotten Leatherworking tasks and/or as optional components that will improve the chances of producing leather armor segments of greater quality (tier) for the Trickster Rogue.
[Worn Swivel Knife] may be purchased for 1 from M'tari Prin'tal in Protector's Enclave (North corner of the Seven Suns Coster Market). Swivel Knives of higher tiers may be acquired from [Professions Booster Pack] and asset packs purchased in the Zen store. Swivel Knives are not bound and may be traded on the Auction House or transferred between players.
A task requiring a Swivel Knife as an asset will take any tier of Swivel Knife in its slot. Higher tiered Swivel Knives serve only to improve chances of producing higher tiered armors.
At Profession Level 3, 4x [Iron Swivel Knife] can be upgraded to produce [Steel Swivel Knife].
At Profession Level 4, 4x [Steel Swivel Knife] can be upgraded to produce [Mithral Swivel Knife].
There is no task that will allow [Worn Swivel Knife] to become [Iron Swivel Knife].