These 5/8-inch stainless contact points fit all Educator brand training collar receivers. Only fits Educator Brand models 300,400,800, 1200, EZ Educator, Pro Educator and BP-504 Barkless Collar, BP-504-C No Bark Collar and 1000 E-Fence. They are great for short to medium haired breeds such as Cocker Spaniels, Australian Terriers, Basset Hounds, Beagles, Border Collies, Blue tick Coonhounds, Cavalier King Charles Spaniels, Chihuahuas, Dalmatians, Doberman Pinschers, Havanese, Mastiffs, Pugs, Rottweiler's, Schnauzers, Shar-Peis and Wire Fox Terriers. It is always best to use the shortest contact point that makes a reliable connection. Warning: As with all contact points, do not leave the collar receiver on the dog for more than 12 hours at a time.