Poisoned Mantis Gauntlet

The  is a NPC-only weapon in Fallout: New Vegas.

The original Mantis Gauntlet can be bought at Mick & Ralph's in Freeside or the Great Khan armory just outside of Red Rock Canyon in the cellar of a ruined house, other than that it is quite rare.

Characteristics
By characteristics it looks like a severed foreleg of a Mantis attached by a Medical brace or something very similiar. The poison is not visible in this picture but the poison would deal a extra 4 damage per 5 seconds or something very close to that.