ECHO 21.2cc 2-Cycle Gas 20" Dual-Sided Hedge Trimmer Clippers - HC-150 21.2 cc 2-cycle, PowerBoost Vortex engine can power through large jobs 20 in. dual-sided, laser-cut reciprocating blades for easy cutting Throttle lock-out prevents accidental throttle engagement Antivibration: Yes Clutch: Centrifugal