The Precision Pulley PXT40B features a 3 7/16 NK bush with bolt, designed for seamless integration into various pulley systems. This component is crafted from high-quality materials, ensuring durability and resistance to wear. The NK bush is engineered to provide a secure fit, enhancing the overall performance of your machinery. Ideal for use in heavy-duty applications, this product meets industry standards for safety and reliability. The included bolt ensures easy installation, making it a practical choice for professionals looking to maintain or upgrade their systems.