Merry Mac Highway-Towable Chipper/Shredder - 249cc Briggs & Stratton Intek OHV Engine, 3 1/2in. Capacity, Model# 12PHT1100M 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