The Black Rapid RS DR-1 Double Strap (Black) is worn around the shoulders & is adjustable to fit most photographers. It will carry 2 cameras or lenses vertically at the side. The locking Fasten R connects the straps to the tripod socket located on either the camera body or the lens. Once connected, the cameras hang upside down, resting securely at the side. The difference between Black Rapids DR-1 & DR-2 is that the DR-1 is for larger framed people while the DR-2 is for smaller framed people. The DR-2 is narrower across the shoulders.