The FingerTech S3m Timing Pulley 42T 5/16-24 is designed for integration with the 3lb Undercutter Weapon Assembly. Crafted from 6061-T6 aluminum, this pulley is compatible with 4mm wide S3M timing belts, making it versatile for various mechanical applications. The bore is threaded to 5/16-24 UNF, ensuring a secure fit. This component is ideal for replacing damaged pulleys or for use in custom projects, providing reliability and precision in performance.