Prong collars are measured by the gauge or thickness of their links. The gauge determines the actual size of the prong links and you will want to choose one appropriate for your dog. The length of the collar is much less important because links can be added or removed. 

4.0mm Collars
Large, heavy links that can be difficult to manipulate. Appropriate for very large dogs in the 100+ pound range.

3.25mm Collars
Medium sized links that offer a good balance between stability and easy manipulation. Well suited to most dogs in the 50-100 pound range.

3.00mm Collars
Virtually identical in size to 3.25 with links just slightly smaller. Only available in chrome and antique brown. Well suited to most dogs 50-100 pounds.

2.25mm Collars
Small links with a greater risk of accidental opening. Suited for dogs less than 50 pounds or larger dogs requiring a sharper correction.

Prong collars are designed to fit tightly, at the top of the dog's neck right behind the ears and directly under the jawline. Prong collars should not be worn loosely or allowed to drape down over the dog's shoulders.

This Sprenger Click Lock Center Plate replaces the center plate on an existing prong collar converting it to an easy to open and close buckle collar and elimantes the need to open individual links.

Manufactured directly by Herm Sprenger in Germany, this buckle is an authentic Sprenger product and is warranty safe.

The clasp is made from Stainless Steel and the safety cover from saltwater-resistant plastic. The guaranteed tensile strength of the buckle is 200kg.

The buckle is one size with connecting holes located in different locations depending on the size of the prong collar it is to be attached to. The buckle is identical to the Click Lock fastener used on other Herm Sprenger prong collars.

Buckle Dimensions

Overall length of buckle: 2½"
Overall width of buckle: 1¼"
Thickness of metal buckle only: ⅜"
Thickness of buckle and safety jacket: ½"