The new EGO 45cm chain saw is a very powerful chain saw that allows users to cut faster while still maintaining great comfort and safety. The saw cuts at 20m/s which means it can tackle the toughest of jobs in no time. To increase safety and simplicity the new saw comes equipped with an automatic chain tensioning system that takes all the fuss and worry out of tensioning. Tensioning is taken care of by a spring system which is activated by simply turning a handle through 90 degrees