SIZE: 2.5mm diameter link x 19.7 inches length; fits necks up to 17.7 inches Recommended by professional dog trainers, this chain slip collar is a safe and effective training tool. Designed for gentle to firm control, it helps correct your dog's behavior with ease. High-quality choke chain features smooth, rounded edges for superior comfort, smooth operation, and safety. No sharp points or rough edges to irritate skin or catch fur. Constructed from electronically welded steel for strength, chrome-plated for durability and shine. Resistant to chewing and suitable for active dogs. Important: Measure your dog's neck and add 2 to 4 inches for proper fit. A slightly longer collar works better than one that is too tight. The collar should fit loosely and be able to slide over the dog's head. This choke chain dog collar is made of polished chrome-plated, double-welded steel links. Will not rust, tarnish, or break. Each end is finished with a polished chrome-plated welded O-ring. Collar size includes O-rings. Ideal for training and control. For best results, select a collar 3 to 4 inches longer than your dog's neck measurement. Features: 1. High-quality stainless steel, strong and durable 2. Smooth, rounded edges for skin-friendly and safe use 3. Silver chrome plating resists rust, tarnish, and breakage Specifications: Material: Stainless steel Color: Silver Size (Diameter x Length): 2.5mm x 19in, 3mm x 21.6in, 3.5mm x 23.6in, 4.0mm x 25.5in Package includes: 1 x Stainless Steel Dog Chain