A handrail can be made of a variety of materials. It can either be attached to a wall, extend from the side of the stair rail, or sit on top of the balusters (vertical posts) on the open side of a staircase. A railing is the barrier which prevents people from falling off the side of the stairs 

Architectural ironmongery or architectural hardware is a term used for the manufacture and wholesale distribution of items made from iron, steel, brass, aluminum or other metals, including plastics, for use in all types of buildings 

A bathroom fixture is a permanent feature of your bathroom, that is plumbed or wired in. You cannot easily or freely move fixtures without renovation work. Examples include bathtubs and toilets. On the other hand, bathroom fittings are elements you include in your bathroom in addition to permanent fixtures.