Quality Herm Springer German made stainless steel plus a Security Buckle Lockable Quick Release. Just slide the red tab on the push button release and the buckle is locked! Guaranteed against rust, tarnish, or breakage when used properly. Proper fit is achieved by adding or removing links -- just snap them in or out. This buckle collar is easy to put on and take off with the side release cliclock buckle. Herm Sprenger’s innovative design replaces the traditional wire eye link with a solid fastener plate that provides a more secure connection. This plus the security buckle makes fastening the collar around the dog's neck much easier and safer. Finest quality precision crafted. Dogs should never be left alone with prong collars. When properly fitted and used correctly, prong collars are very effective and safe training tools. The collar should be worn snug on the neck and should be fit just under the jaw, right behind the ears. The collar should be worn snug on the neck it should be fit just under the jaw right behind the ears. Dogs should never be left alone with prong collars. When properly fitted and used correctly prong collars are very effective and safe training tools. Sizing: When measuring your dog, measure around the neck behind the ears. This is NOT a Martingale type training collar.