Model BX62S PTO Wood Chipper Oversized Rotor w/ Reversable Blades. Tractor HP Recommendation: 18 to 50HP Chipper Capacity - 4" x 10" Rotor Size: 25"Number of Rotor Knives: 4 (Reversable Hardened Steel) Rotor Weight: 110lbs Feeding System: Gravity FeedDimensions (Hopper Folded): 40"L x 42"W x 60"H. C