Grigri

[2] The Grigri works by pinching the rope when it is moving quickly (like in a fall), making it an assisted braking belay device.

This function distinguishes it from traditional belay devices such as a Sticht plate or an ATC, whose braking mechanisms depend entirely on the user controlling the rope in a specific manner to increase or decrease friction.

[3] When used correctly, the Grigri's camming mechanism can assist in holding a climber that is working a route, or hanging on the rope while trying to figure out a climb.

[5]While the Grigri was designed as a belay device, some big wall climbers (such as those climbing Yosemite's Half Dome or El Capitan) have invented novel ways to extend its use and compromise its safety.

For example, some big wall rope soloists use the Grigri (sometimes slightly modified) as a self-feeding hands-free self-belay device.

The manufacturer holds uses outside of those validated come with considerable risks, and its official documentation goes so far as to expressly prohibit certain uses.