Shredder: 24 free-swinging hammers, reversible 3 additional times hardened steel * Chipper: Hardened special steel blade - re-sharpenable mounted on heavy flywheel; chips branches up to 3 1/2in.; outside adjustable wear plate * Hopper Opening: Extra large 18in. x 17in.; with blow back shield * Clutch: Centrifugal - For easy no load starting * Discharge adjustment: 4 position