The PS720 pole saw attaches to your attachment-capable string trimmer with no tools. Perfect for pruning and cleaning up your trees and hedges. 8" bar length cuts logs up to 16" in diameter. Automatic oiler provides consistent lubrication to the bar and chain. Narrow radius bar & safety chain for reduced kickback and increased operator safety. Extension boom included for up to 11 ft reach. Guide Bar: 8" cuts branches up to 16" in diameter. Extension Boom: Yes. Automatic Oiler: Yes.