Incorporates a tight fit with a deep throat. Safety nodes are built into the rear of the throat to keep arrow on the bowstring during draw and let-down. For all swedged end shafts. Sizes available: 11/32" (14.8 grains), 5/16" (13.9 grains), and *1/4" (5.9 grains). Specify size and color. *1/4" T-Nock available in White 1,000 pack only.