The E1 Hand Strap 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. The strap 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.
Note:
Only fits on cameras with built-in booster grip or with an added extension grip