The Multiforst is a Multi-purpose machine able to crush stone 25cm in diameter, mulch wood 25cm in diameter and till the soil up to 25cm deep. STARSOIL. 150-260 HP*. The Starsoil is a gear drive stone crusher up to 30cm and wood mulcher up to 40cm. Capable of working to a depth of 40cm, ideal for clearing land from stones, rock and concrete.