U+ Style

Specifications:

• Fits 0.300" ID shafts
• Fits 0.135" +/- 0.005" center string serving
• Sample of 0.135" OD serving crossbows
• Ravin™
• Scorpyd Deathstalker with Center Serving String size of 0.142" OD
• U+ style 6061-T6 Aluminum nock is design to fit 0.133" OD center serving with 0.122" opening for Ravin 500 
• U+5 style 6061-T6 Aluminum nock is design to fit 0.133" OD center serving with 0.127" opening for Ravin 500 Crossbow