Bearing Pulley, Sliding Window Rollers, Machining Hardware manufacturer / supplier in China, offering Sliding Screen Window Bearing Roller / Sliding Bearing Wheels /Anti Fly Window Plastic Pulley UPVC Sliding Window Roller, UPVC Sliding Window Roller Double Wheels Accessories Hardware Apposite Modern Nylon PVC Plastic Steel Window Pulley, Nylon Plastic V U H Groove Track Roller Bearing Pulleys Wheel 608zz Deep Groove Ball Bearing for Sliding Door/Window and so on.