Arrow Shaft question

[Dry Creek]

I have some xx75 1816's and I need to order some glue on nocks. What size nocks do i need to order?
5/16", 11/32", or 1/4'. Sorry for the stupid question, just didn't want to order the wrong ones.
Thanks
Craig

[stringstretcher]

If I am not mistaken, the 1816 uses the 9/32 nock

Bjorn Type Nocks - dozen or 100 pack
Product ID=102508

Nock size   Easton alloy arrow spine
1/4   15/16/17-16
9/32   18/19-16
5/16   20-16

[Duker]

9/32 NOCK  

[Dry Creek]

Thanks