The 90 Degree Articulating Arm Kit is designed to give you the ability to mount accessories, such as a Monitor, Portable Digital Audio Recorder (we recommend the ZoomH4n) and much more. The Accessory Arm comes with 1/4-20 studs on both ends and is available in two dimensions: small or large. The kit consists of an Articulating Arm, 1-Â¼" Single Rod and our new 90 Degree Rod Clamp. The 90 degree rod clamp offers a quick-release mechanism and is intended to mount any two 15mm rods 90 degrees from each other. This is a very affordable accessory kit that will go perfect with all of your DSLR needs.