Fire rakes are commonly used by firefighters trying to stop the spread of wildland fires. The tough, triangular tines are used to push ground materials which are on fire back onto themselves.
This means the flames are pushed away from fresh fuel onto material which has already been burnt, creating a break which should stop the fire spreading and allow it to burn itself out.
These can also be used when creating fire pits or bonfires to reduce the risk of losing control of the fire. A fire rake can create a space around where you wish to create your fire pit or bonfire removing any possible materials that could alight.