This training collar features a solid fastener plate that provides a more secure connection making fastening the collar around your dog's neck easier and safer. To adjust size, add or remove individual links. The patented center plate construction and symmetrical prong placement provide natural contact for optimal communication. Herm. Sprenger offers a variety of high-quality, specialty chain products. 3.25mm links Fits necks up to 22 inches Safe, effective dog training tools with proper use. Made of high quality stainless steel