Tekkō-kagi, (手甲鉤 lit. "back of the hand hooks"), were a kind of kakushi buki (隠し武器; lit. "hidden weapon") deployed by the ninja of Japan. It is used by The Shredder in almost all incarnations. It was also used by Hattori Kinzō in Mutant Turtles: Chōjin Densetsu Hen and the Foot Assassins in the IDW comics. Weapons of these type are presumably easier to conceal and use in close quarters, depending on the size and nature of the blades. However, in fights involving larger weapons they would be less effective considering their limited reach compared to a sword or polearm.