These classic Herm Sprenger stainless steel pinch collars are designed so pressure is evenly spread around the dog's neck. The ends of the links are also carefully rounded to prevent injury to your dog. Beware of competitor's products that don't meet the stringent requirements of Ray Allen's Herm Sprenger manufactured goods.
2.25mm collar is for a 14" neck and has a swivel at the bottom
3mm is for a 21" neck and has a ring at the bottom
4mm is for a 26" neck and has a ring at the bottom