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From S3 - Keihin Carburetor Adjustment Screw Kit.
Composition: Aluminum screw, Stainless steel spring
Features: Micrometric adjustment, Suitable for Keihin carbs
Finish: Satin, Laser engraved S3 logo, Anodized
Includes: 1 Air Screw and Spring, 1 Idle Screw and Spring