3 Laser Cut Contact Point Holes fit perfectly with most Brands of Dog Collar Receiver (INVISIBLE FENCE, PETSAFE, PERIMETER TECHNOLOGIES, EXTREME DOG FENCE, and MANY MORE.) Invisible Fence/Pet Safe Compatible: Works with Basic In-Ground Fence, Standard In-Ground Fence, Stubborn Dog In-Ground Fence, Deluxe UltraLight Collar, Stubborn Dog In-Ground Fence Collar, Wireless Pet Containment System, and Wireless Fence Collar. Adjustable Sizes for a Perfect Fit: Available in Small (up to 12”), Medium (up to 18”), and Large (up to 27”). Features 3 precision laser-cut holes with 1-1/4” and 1-5/8” spacing (center-to-center). Tough durable construction. Looking for a collar that can withstand your dog's rough and tough playtime? Look no further than our durable nylon strap! This low-maintenance collar is the perfect solution for dogs big and small. Upgrade your dog's e-collar receiver strap! This collar is designed to offer improved comfort and superior receiver compatibility. Ditch your dog's old frayed receiver collar. How did we get our start? We founded Gracie To The Rescue with the mission of providing durable pet products while also helping shelters in need. To The Rescue has given us the opportunity to help shelters and rescue organizations across the country. What makes our products unique? The products we source and sell are all developed in response to the most needed items from rescue donation lists. Why do we love what we do? We believe that every dog deserves a loving home, and we are proud to support local shelters and rescue organizations.