The portable mini ball heads with 1/4" screw thread are compatible with most cameras. The mini ball head can withstand heavy loading and also keep your devices from scratches with the rubber non-slip cushion. 360 degree panoramic photography by screw swivel knob mini ball head, tilting from -90° to +90°. The screw tripod head is easy to use; lock solidly, and move smoothly. Specification(1/4"Female-3/8"Female spigot adapter): Material: Metal Adapter Size (diameter x Length): 15.5mm x 28mm Weight: 8g (each one) One side: 1/4" thread, the other side: 3/8" thread Specification(1/4"male-1/4"male screw adapter): Material: Metal Adapter Size (diameter x Length): 16mm x 19mm Weight: 9g (each one) Both side: 1/4" Thread Specification(1/4"Female-3/8"male screw adapter): Material: Metal Male thread (outside): 3/8" Female thread (inside): 1/4"