Replacement locking nuts in 316 stainless steel with the correct thread for your turnbuckle.For check nut locking turnbuckles. These terminal locking nuts lock the tubular turnbuckle in place and eliminates the need for cotter pins that can catch on lines and rip sails. The 316 Stainless Steel Terminal Locking Nuts provide a great blend of strength and corrosion resistance. Sold in pairs.Key FeaturesAll 316 stainless steel construction for great strength and corrosion resistanceEliminates the need for cotter pinsPrevents vibrations in riggingRight and left handed threadsMade in U.S.A.