From Kotobukiya. This cool Impact Knuckle certainly lives up to its name! This 27th in Kotobukiya's series of model kit accessory weapons, the Impact Knuckle accessory has a spring inside so you can make the fist part really jump out! Not only that, it comes with an accessory so you can turn into into a Pile Bunker, plus a series of connectors and accessories too. This 'high-impact' accessory kit is another cool addition to your modeling arsenal.