Hardened steel Hog Pliers are used to tighten these stainless steel rings around shock cord for permanent installation without burring. Plier's snout has grooves at the correct depth for holding rings in place. Open the jaws and position the hog ring with one hand, then squeeze the comfortable handles closed to crimp the hog ring. These pliers accomodate 1/8 in.-3/16 in. rings.