TenPoint Crossbows Omni-Nock, 0.297 Inside Diameter, Salmon Color (12 Pack) (HEA-140.12) TenPoint Omni-Nocks for Pro-V 22 Arrows; channel "holds" the bowstring in place, the Omni-Nock also prevents flat-nock "shoot-over" or "shoot-under", a growing problem with today's narrow crossbows with acute string angles TenPoints patented Omni-Nock makes other nocks obsolete when it comes to your arrow Nock color is SALMON Fits ANY ARROW with a .297" inside diameter Omni-Nock design features SIX MICRO GROOVES that form three bowstringchannels which ELIMINATE THE INDEXING PROBLEM associated with moon andcapture nocks