IMORDEN Standard 1/4"-20 Male to 3/8"-16 Male Camera Screw Adapter Converter for Camera Cage, Shoulder Rig, Gopro Action Camera, Smartphone, Socket Studio, Flash Light, Monitor(2 Pcs) PRECISION MADE: Made of Aluminum Alloy with polished finish. Solid, durable and anti-rust. VERY PRACTICAL: Standard 1/4-20 male thread and 3/8-16 male on two ends is useful for connecting two different mounting sizes of photographic equipment according to your shooting demand. Total length:20mm/0.79. Comes with two. Any questions, please contact IMORDEN 24/7 customer service.