Secret Powers MICRO Training Collars (NEW SIZE) nylon collar collars listed as WIDE are

collars listed as WIDE are 1

They are double layer and not sharp or serrated on the edge to prevent coat damage

Collar size is measured to the middle hole

The 5/8" is made with all stainless hardware and is perfect for larger dogs

These links are closer in size to the 2

Secret Powers MICRO Training Collars (NEW SIZE) nylon collar collars listed as WIDE areSecret Powers Micro Prong training collars were designed originally designed to fit small dogs, because the larger prongs on standard size collars were too far apart, causing both fit and effectiveness issues. A Micro collar is made up of miniature prongs with a much shorter distance between them than typical prong collars. Micros are especially good for larger dogs with short, sleek coats, as standard sized collars tend to slip down on slippery fur.