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618 Mini Plastic Deep Groove Ball Bearing Pulley/Sheave with U Wheel Mute Bearing for Window and Door Size 8*34*9mm, Find Details and Price about Sliding Guide Rail Roller Wheel High Stability Pulley from 618 Mini Plastic Deep Groove Ball Bearing Pulley/Sheave with U Wheel Mute Bearing for Window and Door Size 8*34*9mm - Guanxian Haibite Plastic Products Co., Ltd.