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High Quality Road Bicycle Mountain Bike Shaft Waterproof Screw / 8mm in Diameter Square Hole Shaft Steel Waterproof Screw. Customizable Specifications: Size M0.8-M22 available; materials include Carbon Steel, Stainless Steel, and more. OEM/ODM Service: Factory direct supply with full customization support for size and material. Wide Surface Treatment: Options include Zinc-plated, Nickel-plated, Anodize, Chromate, Black Oxide, and Dacromet. High Quality Standards: ISO9001 certified with 100% inspection throughout the production process. Diverse Material Options: Available in Steel, SUS304, SUS316, Brass, Aluminium, and various grades. Multiple Certifications: Compliant with ISO, SGS, ROHS standards and various international specifications.