The GRIGRI helps you belay the leader or second with more confidence as well as make single rope rappels*. It is recommended for sport climbs with solid bolted protection and also top rope climbs - where changing modes from "belaying" to "lowering" is the norm once the climber reaches the anchors. The Grigri opens like a pulley (the rope is inserted - as indicated on the side plate), then locked shut and attached to your harness with your belay biner. Use both hands to pay out / take in rope - which feeds smoothly. Should the climber fall, rope tension will rotate the internal cam and apply the necessary friction for a quick stop - a great confidence boost to both belayer and leader. To "lower" or rappel, the rate of descent is controlled by your grip on the free end of rope and also the release handle - concealed along side frame... let go of the handle and you will come to a complete stop. Climb with friends, family or partners of any ability or size and know that the Grigri will help you give a better belay. Recommended for 10-11mm ropes, 9.7 minimum. Instructions included, delivered any where in the US. wt: 7.8 oz