NuFletch Ignitor XBow Nocks Red Universal Fit 3 pk.. 285 .295 and .300 diameter bolts. No adapters needed select and install the Swiss turned insert for your bolt place the LED battery light into the half-moon or flat nocks provided. Nock centering is automatic for unmatched accuracy. LED battery light replacement takes seconds. Package Contents: NuFletch Ignitor XBow Nocks Each multi-pack provides precision inserts for .285 .295 and .300 diameter bolts. No adapters needed select and install the Swiss turned insert for your bolt place the LED battery light into the half-moon or flat nocks provided. Nock centering is automatic for unmatched accuracy. LED battery light replacement takes seconds.