The is one of several Forged Eights with Keeper Hole. These eights include the following:

Image Eight Type C.A.M.P., Version H Midi-size Forged Eight with Keeper Hole C.A.M.P., Version I Midi-size Forged Eight with Keeper Hole C.A.M.P./Lowe Fungo Odd-shaped, bent figure eight Kong "8" Light Plus, Version A Midi-size Forged Eight with Keeper Hole Kong "8" Light Plus, Version B Midi-size Forged Eight with Keeper Hole Kong "8" Light Plus, Version C Midi-size Forged Eight with Keeper Hole	Image Eight Type Kong "8" Light Plus, Version D Midi-size Forged Eight with Keeper Hole Kong "8" Light Plus (805.02) Midi-size Forged Eight with Keeper Hole Rock House Standard-size Forged Eight with Keeper Hole Salewa, Version A Midi-size Forged Eight with Keeper Hole Stubai, Version B Midi-size Forged Eight with Keeper Hole

The keeper hole allows attaching a keeper cord that can be connected to the harness to reduce the rik of dropping the eight. A drawback is that the keeper can easily get entangled with the main line. You may think that the keeper holes on these eights are not in a good placebut where else could it be? If it were on the shank or eye, then the keeper would prevent rigging the eight while the keeper was attached to the user. I recommend simply not dropping your descender, but if yuo have a real concern about dropping the eight, perhaps it would be better to switch to a different kind of descender.

The Midi-sized eights have a compact design that causes the rope to make sharper bends, providing more friction on stiff ropes than a standard-size eight. They also weigh less than most eights. The standard-size Rock House provides less friction than the Midi-sized eights. The Fungo has a bend that allows it to be rigged two ways with differing amounts of friction. The C.A.M.P., Version H is a flat Fungo-equivalent that lacks the two friction arrangements.