BILLET VERSION of the newest technology on the market to lower heavy limbs or objects down with the most precise control. HD stands for Heavy Duty and that's what this is. With a 5000lb WLL, this unit with some 3/4" rope is built to handle whole trees. Quicker and easier to use than anything else out there. Won't burn up your ropes or twist them. Takes seconds to load, change friction output and unload. Additional anchoring point allows for several different uses with less equipment.