Team Fortress 2 Item Definition Indexes,  · This is a list of the item definition indexes in TF2, these are useful for distinguishing an unlockable weapon from its original (for example: The Backburner from an ordinary Flamethrower.) This list is divided in to Weapons, Hats and Crafting Items. Usage: SetEntProp (edict, Prop_Send, "m_iItemDefinitionIndex", index); int iItemDefinitionIndex = GetEntProp (entity, Prop_Send, "m ...