The GS-4 Grip Strap from Olympus is designed especially for use with the HLD-6 Power Battery Holder. The GS-4 Grip Strap connects to the base of the battery holder and to the strap ring of the OM-D or whatever DSLR you are using with the HLD-6 Battery Holder. The Grip Strap has an adjustable velcro closure that will snugly fit any size hand and provide a more secure and stable grasp. Ideal when shooting in situations where running or jostling may be involved or when added stability will make for a more crisp shot. The GS-4 fastens around the back of your hand and provides a comfortable, safer and more stable way to hold your DSLR with HLD-6 Battery Holder.