Two Tone Brass Knuckles Karambit Automatic Knife. This knuckle has been contoured to fit comfortably in the palm of your hand. The brushed finish makes this item an eye catching piece. Being constructed of zinc aluminum this knuckle is lightweight yet lethal especially with an automatic karambit style steel blade inside. Gold on one side and silver on the other side. Overall length is 5 inches Overall Width: 2.5 Inches.