SIZE: 2.5mm diameter link x 19.7 inches length; fits necks up to 17.7 inches Professional dog trainers recommend our chain slip collar. Our choke dog collars are safe and effective tools; gentle to firm pull allows this collar to help control your dog's behavior, ideal for effective correction. Our high-quality choke chains have smooth, rounded edges for superior comfort, smooth operation, and safety. No sharp points or rough edges to chafe skin or snag fur. Ruggedly constructed of electronically welded steel for strength and chrome-plated for durability and shine. Chew-resistant design suitable for active dogs. Please measure your dog's neck and add 2 to 4 inches for a proper fit. A choke chain that is slightly longer will work effectively, fitting loosely around the neck and able to slide over the head (a slightly larger size is better than too small). This is a choke chain dog collar made of polished chrome-plated, double-welded steel links. Will not rust, tarnish, or break. The chain links are terminated on each end by a polished chrome-plated, welded O-ring. Collar size includes the O-rings. The collar should fit loosely around the dog's neck and be able to fit over the dog's head. A useful training aid for improved control. For training purposes, the collar should be 3 to 4 inches larger than the dog's neck measurement and hang loosely (larger is better than smaller). Features: 1. High-quality stainless steel, strong and heavy duty. 2. Smooth, rounded edges, skin-friendly and safe to use. 3. Silver chrome plating, will not rust, tarnish, or break. 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 contents: 1 x Stainless Steel Dog Chain