Black locks

Black Locks is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "Perhaps someone can do something with this."

It has a Grand Exchange buy limit of 8 every four hours, a high alchemy value of 1.9k gp, and item ID 25448.

View on OSRS Wiki

Black Locks shows an active flip setup with a margin of +298 gp and 484 trades over the last 24 hours.

At the buy limit of 8 every four hours, max profit per cycle is about 2.4k gp — high margin with healthy liquidity.