1. Item NO.:K027
2. Door rollers that are tested to pass over 100,000consecutive uses;
3. High quality anti-corrosion chrome plating on all fixtures over time
4. Pulley can push and pull smoothly ,mute
5. Max bearing weight 120KGS
6. Quality control: 10 QC peoples in charge of quality checking. All of the items get checked 100% before shipping
7. Quality warrantee :three years