The mighty mac lsc1100ex chipper shredder is powered by a reliable 10hp briggs amp stratton overhead valve engine which drives the three stage shredding impellor the powerful vacuum created by the direct drive hammerless shredding impeller pulls the leaves into the reduction chamber reducing their volume by a ratio of up to 8 1 this chipper chute will chip branches up to 73cm in diameter with its hardened and resharpenable tool steel knife