Andoer 100mm Cold Shoe Bracket Extension Bar Rail Speedlite Microphone LED Light Video Light Holder for Canon Nikon DSLR Cameras Enables you to attach your DSLR camera to multiple accessories. 100mm long, allows you to mount more than one attachment to your camera. With a 1/4in screw hole on the bottom for tripod or light stand connection. A double locking nut at the bottom, one to fix the sliding bar, the other to fix it with the camera . Lightweight, portable and durable.