A logger uses different sizes of chainsaws to cut down trees. Common sizes of chainsaws used include 16-inch, 20-inch, 24-inch, 30-inch, 36-inch, and 48-inch, with each size being used for different types of trees. The most common trees cut down with chainsaws are trees between 8 and 30 inches in diameter. Each chainsaw size has a different length of its bar, or the saw blade of the chainsaw, so when replacing the chain on the bar it is important to know the length of the bar the new chain will be used on. The chains will have a recommended length listed on the side of the package. If this is not listed, the chainsaw size and bar length can be found on the chainsaw's owner's manual. A new chain should always be measured and cut to the right length before it is installed to make sure it works properly and does not pop off while cutting.