The Pro 11.5 RS from DR is powered by a Briggs & Stratton 250cc engine & uses an overhead valve. constructed from high-carbon/chromium forged alloy steel that holds a sharp edge longer than other cheaper branded chippers would. With 12 swinging hammers that shred organic material of up to ¾ in in to fine mulch. The mulch can then be used for composting or feeding other plants you may have around your garden. Specifications Engine: Briggs & Stratton 11.5 FPT OHVEngine Capacity: 250cc Fuel: Petrol Engine Oil: 4-Stroke Shredding Ratio: 12:1 Shredding Capacity: Up to 0.4 inch in diameter Shredding Hammers: 12 free swinging Chipping Capacity: Up to 4 inch in diameter Weight: 84kg Dimensions: 880 x 730 x 1170 mm Manufacturer Warranty: 2 Year Domestic / 90 Day Commercial