Bearing Pulley, Sliding Window Rollers, Machining Hardware manufacturer / supplier in China, offering Payload 15kg Plastic POM Wheel Bearing Sliding Roller 6X30X10 6X30X12 6X28X6 6X28X7 mm Nylon Roller Pulley Wheel with Bearing, Premium U-Groove Bearing Pulley for Sliding Doors and Windows, Plastic Pulley Nylon Guide Pulley Rolling Bearing Roller Wheel 4X14X6 for Driving Mechanical Equipment or Used in Doors Windows and so on.