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The ARC Nock is specifically designed and engineered to be compatible with the Killer Instinct SWAT XP Model # 1020 Crossbow. This is the only nock acceptable to shoot from the SWAT XP, do not attempt to use any other shape or form of nock. Install the nock on a 22" bolt greater than 400 grains and make sure the ARC nock is glued in at a position that the un rounded edges line up vertically with the odd color vane and that the end of the vanes are at no less of a distance than 1 3/8" to the start of the nock.