This useful Signature Nock from Bohning incorporates an index and alignment feature and a nock recess to keep your arrow snugly fitted. Made of durable, impact-resistant polycarbonate. One size fits all standard carbon shafts and the Easton Uni-bushing System. Weight: 12.7 grains. Throat diameter: 0.111. Pack of 12 nocks. Available in apricot, lime, and white.