LawnMaster FD1501 Electric Chipper Shredder Powerful 15-amp motor, and safe for the environment 10:1 mulch ratio. Not intended for bamboo 8-inch wheels for mobility. Includes collection bag The maximum branch thickness that can be chipped is dependent on the type of wood and the quality ofthe goods being cut, but never thicker than 1-1/2 inch in diameter.For hard wood (e.g. oak/beech branches), the maximum branch thickness that can be chipped is less thanfor soft wood (e.g. pine/spruce wood) For dry or knotted wood, the cutting thickness may also be less.