This hollow tube insert sleeve is an essential component for exercises machines maintenance. Designed to fit securely within square tubing, it reduces noise and vibration while protecting internal parts. Its practical application makes sure optimal performance, making it a valuable addition to exercise machines and training gear. Features -Color:Black -Material:PP, PA -Size:6.00X4.80X4.80cm/2.36X1.89X1.89in -Note: 50mm-40mm; thickness: 1.5mm-2.1mm -Improved stability tube sleeve: the hollow design improves the structural stability of exercises machines, increasing its load capacity -Smooth sliding tube sleeve: precision manufacturing makes sure smooth sliding, reducing friction and noise for a better workout experience -Flexible application: the conversion square tube is compatible with various exercises machines brands and models - construction: made from wear-resistant materials, it extends the lifespan of the apparatus and reduces maintenance needs -Secure fit: enhances the tightness of connections, preventing loosening and ensuring stability during workouts Package list: 4 x square tube hollow sleeve bushings