Bohning S nock( the same size as the Easton Signature Nock )
Insert the nock, align it and you're ready to shoot - no messy, time-consuming gluing. Built-in index and alignment system as well as a nock recess to eliminate cracks and gouges. Fits Easton Uni-bushing® systems and all O/S Carbon shafts. Constructed of durable, impact-resistant polycarbonate. Per 12.
Fits Blackhawk Vapour , Powerflight , lightspeed , Carbon express ect
Fits shafts with internall Diameter 6.5mm or 0.244 to 0.246 inch