The Carboy shelf system has a number of unique features that distinguish it away from the competition. Past being manufactured from #304 stainless steel with a #4 finish, each shelf unit is built with a rail system on the underside for support. If requested, the unit can be supplied with an adjustable graduated cylinder racking system. This system adds our adjustable C and H brackets which allows you to custom fit any of your cylinders for drying and storage.