Fork Cap Socket 39 mmMachined from 6061-T6 aluminum with durable blue anodizing and laser engraved markingsUse for removal and installation of the fork cap nut (1-3/8" hex)Thin socket measures only 9/32" deep and 5/8" tallO-ring insert to help protect the top of the cap1/2" square driveFits most Big Twin® and Sportster® models.