A lever is one of the six simple machines. Levers can be used as links to connect the various moving parts of a machine, so, for instance, one part of a machine can move another part by pulling a link that can pivot at an intermediate point. Levers also take form in a variety of hand tools such as scissors, pliers, claw hammers and wheelbarrows. One of the main features of a lever that makes it useful is that it can have a mechanical advantage. This means that when a force is applied to one point on the lever (e.g. the end), another part of the lever can exert a larger force. So, for instance, a tool called a bolt cutter has long handles which give it a lot of mechanical advantage. This allows it to cut bolts. Another tool called a lopping shears also has long handles. This enables it to cut thick branches.