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High-Quality OEM/ODM 12b-1 Stainless Steel Roller Chain Sprocket. Diverse Material Options: Available in Carbon steel, SS304, Nylon, S325 steel, and more. Multiple Bore Types: Offering QD bore, finished bore, pilot bore, and taper bush bore. Custom Surface Treatment: Options include Blacking and zinc-plating for enhanced durability. OEM and ODM Support: Full customization available for material and surface treatment. Wide Standard Compatibility: Compatible with ANSI, ASA, KANA, and British standards. Fast Stock Delivery: 1-2 days delivery time for items available in stock. No MOQ for Stock Items: No minimum order quantity required if products are in stock. Professional Logo Marking: Custom logo application available upon customer request.