The Volcano Grεy hammer split rock results from the processing of large volumes of natural stones. These natural rocks are processed using a special tool (hammer) which crushes the volume into smaller pieces. They are then loaded directly onto a tipper four-axle truck. Their final processing is done in the project on site, where the craftsman chops them and adapts them to the desired aesthetic ensemble. As for their application, they are used both for building large surface walls and for building fencing walls.