Slug Nylon Round 5/16" is a slug used to secure mains or mizzens to their spars and make raising and lowering sails easier. This sail slug features a nylon barrel and a rocker that helps prevent the slug from tilting in the slot. Sail slugs are typically secured ahead of the boltrope and inserted in the mast slot instead of the rope. Secure this nylon slug to a sail with webbing, webbing and grommet, shackle and grommet, or just a shackle. Sail slugs also keep the sail stacked in the slot when a sail track stop is used.