Features: The car is durable through special processing and heat treatment. Compatible with both I-beam and H-beam rails. Special design for smooth mobility. The rail width is easy to adjust. ● Four cars use high quality sealed ball bearings that do not require oiling. Specifications: Minimum Rotation Radius: 59.1 inches (1,500 mm); Rated Load: 1.6 t; Applicable Horizontal Rail Width: 3.9 - 4.9 inches (100 - 125 - 150 mm); Specifications 2: For manual use; Nom: 1 1/2