The Stihl MS660 chainsaw is a powerful professional chainsaw that is designed for very hefty use in extreme circumstances. The Stihl MS660 comes with extreme engine power and maintains a relatively low chainsaw weight. This engine power enables the Stihl MS660 to cut through very hard timber. The Stihl MS660 chainsaw comes equipped with a lateral chain tensioner, an easy starting system, and a standard Stihl high performance chain. This model comes with a thirty inch bar. This Stihl model is also available with a eighteen inch bar, twenty inch bar, twenty five inch bar, and a thrity six inch bar.