Machined from 6061-T6 aluminum with durable blue anodizing and laser engraved markings, Use for removal and installation of the fork cap nut (1-3/8″ hex), Thin socket measures only 9/32″ deep and 5/8″ tall, O-ring insert to help protect the top of the cap, 1/2″ square drive, Fits most Big Twin? and Sportster? models.