Steel Knuckles

The Steel Knuckles were brass knuckles obtained by Jacob and Evie Frye during the nineteenth century. These brass knuckles were of a modest design, consisting of steel and wood. The Frye twins received this weapon as a gift from Sergeant Frederick Abberline of the Metropolitan Police Service after they had helped him locking up several members of the Blighters.

Reference

 * Assassin's Creed: Syndicate