The MAG-PRO CLAMP is a multi-purpose filming aid that will open and attach to anything 3 inches or smaller in diameter. The clamp is designed to hold your cell phone or GoPro for a second filming angle. This clamp was also designed to work in conjunction with the tether in a saddle hunting setup like shown in the product photos. The MAG-PRO CLAMP weighs roughly 6 ounces and is backed by our BEND IT, BREAK IT, SNAP IT, LIFETIME WARRANTY.