- Use for removal and installation of the fork cap nut (1-3/8" hex) - Thin socket measures just 9/32" deep by 5/8" tall - O-ring insert to help protect the top of the cap - 1/2 inch square drive - Machined from 6061-T6 aluminum with durable blue anodizing and laser engraved markings / Fitment: Most 87-22 Big Twin and XL Sportster models with 39mm fork tubes (NU)