The 9/16" hog rings are used to secure the deer fencing to the monofilament wire. and provide rodent control at the bottom of the deer fence. We recommend using a hog ring every 12" on your deer fencing. Hog rings are galvanized to last for years out in the field. The Hog Ringer Tool we offer is required to crimp the hog rings in place. The hog rings are available in packs of 2500.