This unit was too heavy to use on our excavator. It comes with two extra chainsaw bars and four extra saw chains. The DS series rugged chain and bar dangle saws are designed for excavators, track feller bunchers and loader type carriers. The grapple style arm design allows operator to handle standing or fallen timber to fell, pile, cross-cut, trim, top and shovel. These heads are ideal for right-of-way clearing, selective cutting, salvaging storm timber and harvesting large trees. The dangle saw can be removed in a matter of minutes so that the carrier can be used for other purposes. The DS-20, recommended for the larger high flow hydraulic skid steers and 10-15 ton excavators, has a 3/4 pitch saw chain running on a 28" bar capable of cutting 20" in a single pass or cut 28" in multiple passes.