Feature: 1. High Strength Steel Construction: 4 wheel trolley assembly has a high load capacity of 245kg, made of high strength iron and S45C material for durability and impact resistance. CNC precise machining technology for reliable performance. 2. Enhanced Stability: Welded bearings and axles of this trolley assembly ensure superior stability and safety. Features deep groove ball bearings for quiet operation. 3. Impact Resistance and Rust Protection: The light duty trolley assembly is zinc plated for rust resistance, for added durability and long lasting performance. 4. Heavy Duty Load Capacity: With a load capacity of 245kg and a breaking load of 3000kg, this trolley assembly roller is designed to handle heavy loads with ease. 5. Compatible with Various Support Channels: Suitable for electric hoists such as PA200‑PA1000 and all 1‑5/8in taller strut channel roller trolley. Low noise operation ensures a quieter working environment. Specification: Item Type: 4 Wheel Trolley Assembly Material: Iron, S45C Load Capacity: Approx. 245kg / 540lbs Breaking Load: Approx. 3000kg / 6613lbs Application: Suitable for Electric Hoists Installation PA200-PA1000, for All 1-5/8inTaller Strut Channel Roller Trolley . Package List: 2 x 4 Wheel Trolley Assembly Note: 1. Size may has slight errors.2. Shipped without screws.