Premium Op/Tech line. I have been using their products for years to hang my heavy camera/lens on my body or backpack depending on how I set up the adapters and have never had a problem or fear of letting go and my expensive gear on the ground could fall. on the ground, in the Grand Canyon, on the side of a cliff, etc. Due to their simple but brilliant idea of using matching nut/father ends when not in use to attach gear to harnesses, the ends of the adapter together, creating a comfortableβ¦