Herm Sprenger Prong Collar Extra Links, 2.25 mm Herm Sprenger Model 6424 | Steel Prong Link | 2.25 mm Package of 1 Prong Link Dimensions are 1 inch (2.75 cm) long x 3/4 inch (2 cm) wide Read Product Description Section for additional instructions for size, fit, and care Made in Germany.