The FingerTech S3m Timing Pulley 15T - 0.125in Bore is crafted from durable 6061 aluminum, ensuring robust performance in high-torque applications. Designed with a 3mm pitch, it accommodates a maximum belt width of 4mm, making it suitable for precise mechanical operations. The pulley features a 0.125-inch bore, providing compatibility with various shafts. A 4-40 setscrew is included to secure the pulley firmly in place, enhancing stability and reliability during use.