DR Chippers do one thing: they chip branches. They are the only wood chippers available for homeowners that self-feed most materials. Drop in a branch, and watch it chip on its own, without you force-feeding it! These machines use a razor sharp chipping knife mounted on an extra-heavy (up to 76-1/2 lbs.) flywheel that stores inertia as it spins. They will devour branches up to 5-1/2" thick (PRO-XL model).