Zipp Service Course SL Carbon Seatpost Size:20MM Setback Descent control Ergonomic handle allows Kitchen Sink Descent control Ergonomic handle allows you to easily unblock the rope and lower someone 3:1 mechanical advantage of the handled camming mechanism helps control rope feed on small diameter ropes and requires less effort on the handle for large diameter ropes• Plastic components are made from recycled nylon for a more environmentally responsible approach This simple bowl shaped head with the shank welded to its center is capable of grasping the ground and is used extensively for moorings ● WEIGHT BASED ON Service Course SL 27 it’s possible for nearly any rider to achieve the perfect fit