The GriGri's self braking function helps the belayer catch and hold a climber, making it great for working routesWorks equally well for lead climbing and top ropingErgonomic design makes for smooth, controllable lowers. also great fo rapelling on single ropes - perfect for setting and cleaning routesUse is similar to that of a conventional belay devices: paying out rope is done using both hands; arresting a fall is done by holding the free end of the ropeFor lowering and rappelling, the rate of descent is controlled by the hand holding the free end of the rope (rope is released with the handle)Weight: 225g For use with single ropes between 10 and 11 mm in diameter.