Upgrade your machinery with the Vleant Plastic Pulley U-Groove Pulley Wheel Kit, featuring six precision-engineered nylon round pulleys, each equipped with a high-quality 625Z double metal shielded steel bearing. Measuring 5x21x7mm, this set is tailored to meet the rigorous demands of diverse industrial applications. Crafted from top-grade POM material, these pulleys boast exceptional wear resistance, a low friction coefficient, and robust mechanical properties, making them for prolonged use in heavy-duty environments. The innovative deep U-groove design perfectly accommodates the enclosed 625Z bearings, ensuring whisper-quiet operation, efficient power transfer, and minimized wear. The heart of these pulleys lies in their premium 625Z double metal shielded bearings. Made from bearing steel, these bearings are designed to withstand harsh conditions while providing steadfast support and reliable rotation. The shields effectively guard against contaminants, prolonging the life of the bearings and maintaining optimal performance over time. Installation is a breeze with these lightweight, round nylon pulleys. Their user-friendly design allows for swift integration into both new and existing systems, streamlining your workflow and minimizing downtime during setup.