Own a pet that likes to escape? Here is the answer. Gold Standard cage locks are a quality, easy to clip, locking device that will ensure your pet stays where you want him. The lobster clasp design graps from both sides. Easy for you to open but difficult for pets. Ideal lock for pet cage doors. Makes sure your pet is secure. Lobster clasp style cage door lock. Gold Standard quality. Size 2 inch long x 5/8 inch wide. Hole size 3/8 inch (closed) and 3/4 inches (open).