Features1Adopting ultra light aluminum alloy, numerical control processing, the surface anodized midrange fine tuning screw, bright color. 2Smooth adjustment of fine internal thread coated with grease. 3Effectively adjust the front and rear gear, to solve the jump gear and shift the inflexible problem. 4Easy to install and remove. 5Great accessories for cycling lovers.SpecificationItem Type: Bike Speed ScrewMaterial: aluminium alloyQuantity: 6 pcsScreen size: 62x62mmSize: variable speed fine adjustmentSpecification: variable speed universalApplicable: mountain/road/BMX speed/brake lineParts: bicycle transmission adjustment screwPurpose: fine adjustment screw in bicycle shiftComponents: fine adjustment bolt for chain extractorType: front derailerScope of application: 4 mm shift cable and 4.5 mm shift cablePackage List6 x Bike Speed Screw