Feature: 1. Heavy Duty: Trolley assembly is made of strengthened carbon steel and stainless steel, sturdy and reliable, impact resistance, hard to break, deform, fade, rust and corrosion, withstand long term use. 2. High Performance: The bearing trolley roller is safe and reliable, with tight connection and stable performance can ensure smooth operation and reduce noise. 3. CNC Process: Forged by CNC tight process, the surface is smooth and free of burrs, with uniform stress, beautiful appearance and smooth design. 4. Versatile to Use: Trolley assembly is suitable for a wide range of different usage scenarios and is ideal for mounting on a ceiling trolley system or electric lifts, you can also use it in DIY projects according to your actual situation. 5. Stable Running: The 2 wheel trolley assembly roller is galvanized to ensure the rust resistance of the wheeled trolley. Smooth surface, good coordination and high hardness. Specification: Item Type: Trolley Assembly 2 Wheel Material: Carbon steel, stainless steel Color: Silver Uses: Can be used for family activity doors, wardrobe cabinets, large iron doors, curtains, automation equipment pulley components, factory track pulleys. Package List: 1 x Trolley Assembly 2 Wheel