The Carter ITS Kit ARKI3420 is designed to make changing springs and modifying trigger tension a breeze. This comprehensive kit includes four thumb spring options and two hex keys, allowing archers to easily find the perfect tension for their shooting style. The Interchangeable Tension System (ITS) ensures quick and simple adjustments by removing the lower casing screw, inserting the new spring, and securing it back in place. Ideal for those looking to customize their Carter thumb releases, this kit provides reliable and consistent performance, enhancing overall accuracy and control.