Product Description Material: Iron Color: Stainless Steel Primary Color M: 3.0mm*50cm L: 3.5mm x 55cm Applicable animals: Suitable for large and medium sized dogs such as Samoyed, German Shepherd, Caucasian, Tibetan Mastiff, Rottweiler etc. Package Contents: 1 * large chrome dog chain 1. Chrome steel fork clamp with quick release SNAP: This model features a quick release buckle for easy on and off of the collar. 2. Detachable links: Slightly chamfered teeth. Interlocking links, each with two blunt jaws. Ties can be added to lengthen the collar or removed to shorten it. Up to 4 links can be added or deleted. 3. How to choose the size : The collar should fit snugly under the dog’s ear, measure the circumference of the dog’s neck and add 3 inches. 4. Design: The collar has a central plate to position the links to apply even pressure on the dog’s neck.