Merry Mac Commercial Chipper/Shredder - 570cc Briggs & Stratton Vanguard Engine, 4in. Capacity, Model# SC262-18VEMC 18 HP (570cc) Vanguard engine with electric start Chips logs up to 4in. dia., shreds branches up to 1 1/2in. dia. 48 free-swinging hammers Chipper hopper opening is 23 1/2in.L x 21 1/2in.W Shredder hopper opening is 19in.L x 13 1/2in.W