There are many types of power saws available for use on the farm, the job site and at home. When choosing a saw, knowing what they do is essential for completing any job, large or small. Circular saws are handheld with a round blade. This saw has a safety guard to prevent injury, and some have a sawdust collection bag on them, to make cleaning up easier. They are used primarily for straight cuts. A jigsaw can be versatile because it is easily manipulated to make curved, detailed cuts. It can have variable speeds. A reciprocating saw is a larger saw, used for less detailed , larger work. There are blades made for cutting many different materials, including wood, fiberboard, tile, and metal for most saws. Most power saws come in corded or battery operated styles and are sold individually or in combo packs with other tools of their make. Some have interchangeable battery packs, eliminating the need for multiple chargers.