Tanaka TCG24EBSP 2-Cycle Gas String Commercial Grade Trimmer, 23.9cc Tanaka 23.9cc commercial grade 2-cycle engine for maximum reliability and durability Aluminum clutch housing prevents clutch from overheating Lined solid steel drive shaft drastically reduces vibration for maximum comfort Built in spindle lock eliminates need for tools when changing cutting attachment Padded front and rear handles provide longer operation with less fatigue