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D Shaft Guitar Audio Volume Rotary Switch Central Control Knob. Customizable Structure: Structure is customized to meet specific application needs. Wide Material Options: Supports AISI 303/304/316L, Aluminum 6061, Brass, Titanium, etc. Multiple Finish Types: Offers Machining, Polishing, Zinc-Plated, Anodizing, and more. Flexible Size Options: Standard 6mm/1/4' bore size or customized dimensions available. Premium Packaging: PET blister tray prevents scratches and color shedding during shipping. Strict Quality Control: 100% inspection by IQC, PQC, and FQC teams before shipment. Multiple Certifications: Products certified with ISO, GS, RoHS, and CE standards. OEM/ODM Service: Full OEM and ODM services available for custom designs.