Aluminum is a lightweight, corrosion-resistant metal that comes in a variety of shapes and sizes, from structural angles and channels to packaging and wrapping foil sheets and rolls. Solid sheets or bars of aluminum can be machined into metal parts and products using aluminum bars, plates, and sheet stock. Light, air, and water can travel through the gaps in aluminum expanded and perforated sheets. For walkways, mezzanine platforms, and other flooring applications, aluminum grating is a viable alternative to steel grating. Aluminum tube stock has a hollow center and is commonly used for framework, fence, and support posts. It is available in rectangular, round, and square shapes.