This hand mirror is an extremely useful piece of equipment, fitting it onto the back of your hand; either with a bungee cord, or sewing onto your glove.  At the twist of your hand, it allows you to quickly and easily see behind to you find your buddy, or check your first stage for leaks, etc.

The mirror is 50mm (2 inches) X 30mm (1.2 inches) and has a 3mm hole in each corner for attachment.  It can also be used as a signalling device in emergencies by reflecting the sun or a torch beam towards a rescue boat.