5/16" Nock AvailabilityIn stock SKU 4703 Be the first to review this product $1.00 Quantity : Add to Cart Add to Wishlist Add to Compare List Email Arrow Nocks Details Arrow Nocks5/16" Nocks (for .278-.298" tubing & 5/16" dowels). Used to connect shock cord to spars. Fit on Fiberglass rod sizes shown. Use nock inserts with Glasform tubing. Point the end of wooden dowels with a pencil sharpener.