The screw adapter is made of nickel-plated brass for a long service life. It can fit 3/8 inch threaded hole and 1/4 inch male thread. It comes with a washer to protect the camera. Box Contents: 1 x Screw, 1/4 "Female to 3/8 Male Adapter 1 x 3/8 "Female to 1/4 inch male thread adapter