Heavy-Duty Build: Trolley assembly made with hot-rolled carbon steel for impact resistance. Galvanized for rust resistance. Operates quietly with smooth performance. Bearings and pins are firmly welded for stable operation. Steady Operation: Wheel trolley features standard deep groove ball bearings, ensuring quiet and smooth use. Bearing welding ensures precise positioning and enhanced stability during operation. Unique Design: Bolt is hidden within the fastening groove, preventing obstruction in the channel. 4-wheel heavy-duty trolley assembly with silent wheels for easy operation. Simply push the wheel into the pillar channel to use. Style: A - wheels with rings Color: Silver Material: Steel Package Contents: 2 x Silent Trolley Note: Other products are not included. Light reflection and display differences may cause slight variations in color. Measurement may vary by +/- 1-3 cm.