Demo saws consist of a circular blade with serrated edge mounted on top of a motor that makes it rotate and enables the user to cut through a variety of surfaces using it. The motor itself runs on electricity. Most varieties have a cable with a plug that takes electric power from a wall socket. Some newer models are however wireless. The wireless varieties offer a greater choice of mobility as they can be taken to places that do not have wall sockets for electric power.

Wireless demo saws have a battery that stores the energy on order for it to be used later. The battery itself can either be a dry cell version or a traditional acid based battery. Furthermore, the battery can be a permanently installed one or a disposable one that can be discarded once it is no use. Lithium ion batteries have been revolutionary as they can hold a charge for longer than graphite batteries and can be recharged in a very short span of time.

The blade can be made of iron, steel, other metals or an alloy. Carbon is usually added to iron in order to increase the strength and durability of the blade. The addition of carbon makes iron harder and firmer. However, care should be taken to not add too much carbon as an excessive amount of carbon makes the resulting alloy brittle and more prone to breakage. Breakage of a blade is not only inconvenient but also potentially very dangerous if it occurs while the demo saw is being used. Most accidents involving demo saws occur when a blade made of iron infused with a large quantity or iron breaks midway through operation. For this reason, demo saws with carbon based blades are best avoided as they are a hazard.

It is also possible to coat the blade with a chrome plating. A chromium plating makes the blade resistant to water, acids, rust and corrosion. This increases the lifetime of the blade and allows it to be used more frequently than would otherwise be possible. A chromium coating also makes the blade heat resistant and this also contributes to increasing the life of the blade. For industrial grade demo saws, the blade might be made of diamond or another hard mineral. Diamond blades are typically the most hard ones available and are not adequate for domestic usage. Demo saw for sale that have diamond blades are often used in the field for cutting rocks, boulders and stones. A diamond blade offers more versatility and increases the range of materials that can be cut with a demo saw. However, diamond blades are often prohibitively expensive in .most cases and there are other cheaper options that fulfil the needs of most domestic users.