The Accu-Tough nock is designed specifically for our new Kinetic line of shafts.á Built with durability and accuracy in mind, the Accu-Tough nocks will live up to their name! Fits: Kinetic Hunter , 300 , 400 , 500 , Big Game 200, Kinetic XT , 300 , 400 , 500 , Big Game 200, Kinetic Pro , 300 , 400 , 500 , Big Game 200. Black, 12 Pack.