On April 10, 1849, Hunt was granted US patent #6,281 for his safety pin.
It was made in New York, NY.
The safety pin was made from one piece of wire, which was coiled into a spring at one end and a separate clasp and point at the other end, allowing the point of the wire to be forced by the spring into the clasp.
The clasp serves two purposes. To form a closed loop for fastening the pin to whatever it is put on, and to cover the end of the pin to protect the user from the sharp point. Safety pins are commonly used to fasten pieces of fabric or clothing together.