Product detail: FEICHAO Tripod Mount 1/4 Mother Teeth to 1/4 Female Screw Standard 1/4 - 20mm Teeth Tread Screws for Tripod Magic Arm Camera DSLR Description: Material: Made of metal materials, durable. 1/4 1/4 dual bus adapter tooth screw for electric, rail, backhoes, lamp holder, such as the position of three Tripod Adapter. With standard 1/4"-20 through hole design, suitable for the camera and magic arm which needs connect each other with 1/4" screw hole. Replacement part for Magic Arm 7" and 11"and compatible with any Articulating magic friction arm with center 1/4"-20 thread. Total length/height: 20mm (measured by hand, may be a little more or less) Outer diameter: 20mm Package Include: 2/5Pcs x 1/4" to 1/4" screw adapter