Let's get started all ready! LEGO's description:Hammer out those crystals!Krakk! Krakk! Krakk! The rough, tough Granite Grinder is hunting for crystals, and its double-pronged jackhammer is just the tool for the job! Smash apart rocks, load crystals into the trailer, and haul ‘em back to base. Jackhammer really works when vehicle treads roll!