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Double Window Rollers with Steel Frame and Plasitic Rollers Can Adjustable Withing or Without Bearing Jzhl-Sc-019. Durable Steel Construction: Made of steel with zinc plated finish for long-lasting performance. Adjustable Design: Double window rollers with plastic rollers, adjustable with or without bearing. OEM Service Accepted: We accept OEM orders to meet your specific branding and design needs. Fast Delivery: Standard delivery time is 15-20 days from Shanghai Port. Sample Available: Samples are available for quality check before bulk purchase. 1-Year Warranty: Comprehensive 1-year warranty with compensation for after-sales service.