window and door roller, stell roller, aluminium roller, maily export to MILLDE EAST market window roller ST113-T 1.Excellent Surface 2 ... 50 kgsWindow roller ST113-T1. Material: Zinc Alloy frame and Copper wheel2. Surface treatment: Zinc electro plating, nickel ... Easy to install, safe, durable and Heavy loading Ability4. Suitable for many different profile5. Load capacity 50 kgs window and door roller