The Herm Sprenger Stainless Steel Ultra-Plus Prong Dog Training Collar with ClicLock is a safe, easy-to-use dog collar ideal for walking, obedience training and behavior correcting large and strong dogs. It has rounded links for comfort and stainless steel for a rustproof and sea-water-resistant collar. It features a ClicLock fastening plate that keeps your dog secure and gives you confidence in their safety. The fastened plate also provides a secure connection, making fastening the collar around your dog's neck easy. Its patented center plate construction and symmetrical prong placement provide even pressure and natural contact for optimal communication. To determine your needed dog collar size, add 4” to the circumference of your dog's neck and add or remove individual links to adjust the size. Founded in Ohio in 1968, Coastal Pet is committed to producing and delivering quality products that people trust for the pets they love. Coastal Pet is also a huge part of establishing industry standards for product safety, strength and durability throughout the years. We make products for dogs and cats of every size, shape and lifestyle.