Bearing Pulley, Sliding Window Rollers, Machining Hardware manufacturer / supplier in China, offering OEM Nylon R-Groove Window Plastic Pulley Wheels with Bearings Roller for Aluminum Sliding Door, OEM Nylon Pulley Wheels with Bearings Plastic Pulley U-Groove Bearing Pulley 8X36X13 mm, Premium Brass Sliding Shower Door Rollers for Curved Glass and so on.