Standard 1/4"-20 Male to 1/4"-20 Male Threaded Tripod Screw Adapter Standard Tripod Mounting Thread Camera Screw Adapter Converter, Precision Made (5 Pack) Easy to use.Precision made 1/4"-20 to 1/4"-20 (male to male) metal tripod screws,silver plated, international standard. This is an universal adapter spigot stud for the studio use. approx.Total length:20mm approx.diameter:16mm 5 pieces pack.