STAN SX4 Thumb Release Large Heavy Metal. From the first movement of your shot process to the exact moment the string releases its new lock system fires with unprecedented speed precision at the speed of thought. Built for archers who demand repeatability under pressure its spring-assisted hook minimizes the impact of micro-movements and biases into the same position every shot for dependable performance. Custom T10 Torx hardware securely locks in thumb post placement finger position travel and tension adjustments without the risk of stripping while fully adjustable ergonomics allow shooters to fine tune the feel to match their exact preferences. From practice sessions to high-pressure moments integrated features like the trainer lock and wrist strap compatibility make the SX4 as practical as it is performance driven. Features of STAN SX4 Thumb Release Ultra-Fast Spring-Assisted Hook Reduces latency from decision to release limiting the impact of micro-movements Consistent Hook Positioning Biases into the same location every time for repeatable reliable execution Custom T10 Torx Hardware Locks thumb post finger travel and tension without stripping Fully Adjustable Ergonomics Fully adjustable tunable finger position travel tension and thumb barrel position for a personalized feel. Trainer Lock + Wrist Strap Compatible Built-in training capability and real-world usability features Package Contents: STAN SX4 Thumb Release STAN 8501: SX4 Thumb Release Large Heavy Metal