The Saunders Forked Horn™ Bow Square positions Nok-Sets® accurately. The archery bow square body is made of tough polycarbonate. The engineering grade marked gauge swings away to crimp the Nok-Set® with the square still on the string. 5/16″ rod centers perfectly on arrow rest. Ideal for shoot through rest. Offset allows use with kisser. Gauged swing gate comes in green and orange.