Nock pins for easton arrow shafts.#1 - to fit ACE shafts 1250 - 370, Pro Comp shafts 1150 - 1000 and Avance shafts 2000 - 1400.#2 - to fit Pro Comp Shafts 880 - 520 and Avance shafts 1150 - 730.#3 - to fit Pro Comp shafts 470 - 420 and Avance shafts 880 - 550.X10 - to fit X10 shafts.X10 Protour - to..