E2 Hand Strap

Greatly improve your stability and accuracy
great for digital and film SLR cameras
it adds security to hand-holding a camera, and was designed to be used only with cameras that have a built-in power booster or grip, or where an optional power booster or extension grip has been added.
it attaches with one end to the eyelet at the top of the camera, and the other end to the eyelet in the base of the booster / grip.