1Heavy 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. 2High Performance: The bearing trolley roller is safe and reliable, with tight connection and stable performance can ensure smooth operation and reduce noise. 3CNC Process: Forged by CNC tight process, the surface is smooth and free of burrs, with uniform stress, beautiful appearance and smooth design. 4Versatile 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. 5Stable 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.