Herm Sprenger Prong Link This link extension for Herm Sprenger Prong Collars allows custom fitting of collars to suit individual needs. Each link is made of high-quality German steel and is available in four weights. Features: · One link per order · Each link adds 1 1/8"L to collar · Adds length to create a custom fit · Fits Herm Sprenger Collar (item #100204) Item Specifications: Size: Lightweight 14 inch (2.25 mm) Mediumweight 18 inch (3.0 mm) Heavyweight 20 inch (3.25 mm) X-Heavyweight 22 inch (3.9 mm)w