StarMark Collar LinksIncludes 3 LinksFitting the Triple Crown Collar is easy.Using your thumb and forefinger, snap the links together, ensuring that both hooks are set firmly on the bars. (You may snap or unsnap the collar at any link.) Then position the collar so the cord rests at the top of your dog's neck. To remove the collar from your dog, use your thumb and forefinger to unsnap the links. Do not attempt to slip the collar over your dog's head. The collar should be snug, but not tight, around your dog's neck. Add or remove links as needed to ensure proper fit.Sizes:Small(used for small collar)Large(used for large collar)