Herm Sprenger Stainless Steel Prong Buckle Collar Medium 3.2 mm x 22" (50108) Herm Sprenger Ultra Plus Training Collar with Center Plate and ClicLock Model 50108 | Stainless Steel | (10) 3.2 mm Prong Links Center plate assembly from which five (5) prong links are assembled on both side of center plate with prongs links placed directional toward buckle. ClicLock release snap buckle with D Ring for lead attachment. Buckle design simple to use by those with compromised hand dexterity. Manufacturer factory assembled size fits neck size up to approximately 18 to 20 inches depending on fur type and fur depth. Prong links can be added and removed to adjust fit. Collar opens to approximately 22 inches. For dogs with maximum weight of 40 kg or 88 pounds. Prong links can be added and removed to adjust fit. Additional prong links can be purchased separately. Read Product Description for additional instructions for sizing, fit, and care. Herm Sprenger authenticity is verified by the embossed logo on the center plate, specific rings, and junction components.