1. Surface brushed treatment, resistant to corrosion, rust and oxidation, with longer lifespan 2. Strong and durable, with high elasticity 3. Rubber wheels, with excellent noise reduction effect. Metal wheels, with long service life 4. Comes with matching screws. The screw grip is tight and there is no slipping phenomenon 5. 4 compression springs, easy to install 6. Suitable for various scenarios to meet different needs. It can be used for fire doors, double-leaf wooden doors, office doors, and large gates, etc 7. Materials: 304 stainless steel / 201 stainless steel / iron 8. Process: brushing process
