Heavy duty sliding door roller Aluminium frame, Nylon roller, Real bearing. Sliding door roller1. Aluminium frame;2. Nylon roller;3. Real bearingSingle roller WL-WR025ADouble roller WL-WR025B We are one of leading manufacturer specialized in aluminium door and window accessories in Ningbo, Zhejiang prov.. Our mainly products are window latch, sliding lock, pulley, handles, operators, Joint ...