A small, press-fit nock designed for "D" loops. The Blazer Double Lock Nock has a dual detent feature that's just tight enough to keep your shafts on your string without affecting its release when shot. Fits Easton Uni-Bushing system and standard carbon shafts. Made of durable, impact-resistant polycarbonate. Weighs 10.3 grains. One size fits all.