BCLONG Crank arm fixing bolt BB central axis screw one-piece crank cover M15M18M19M20

describe: * 100% brand new and high quality * Made of high-quality materials durable and practical Specification: *Compatible with: road bike/bike/mountain bike *Material: Aluminum alloy *Colour: Black *Size: M15(15*28mm)/M18(18*28mm)/M19(19*28mm)/M20(20*28mm) *Weight: about 9g The package includes: 1 x Crank Screw notes: 1. Due to various factors such as monitor brightness light brightness etc. the actual color of the product may be slightly different from the picture displayed on the website. 2. Please allow for slight manual measurement deviations i