Steel platelegs

Steel Platelegs is a free-to-play item on the OSRS Grand Exchange in the armour category.

In-game examine text: "These look pretty heavy."

It has a Grand Exchange buy limit of 125 every four hours, a high alchemy value of 600 gp, and item ID 1069.

View on OSRS Wiki

Steel Platelegs shows an active flip setup with a margin of +53 gp and 4,097 trades over the last 24 hours.

At the buy limit of 125 every four hours, max profit per cycle is about 6.6k gp — high margin with healthy liquidity.