Titan Extra Pinch Links (3.3 mm) come in a 3-pack and are used to extend the length of a prong training collar. Designed for medium/heavy prong collars, each chrome-plated steel link easily snaps into your existing collar to add circumference as your dog grows or if a looser fit is needed. These extra links maintain the same prong design and strength, ensuring the collar continues to function effectively and securely.