The rugged Thunder Driller is the most important vehicle on the Power Miners team. With its massive double-geared, auto-rotating planetary drill, it tunnels through solid stone to reach deep underground caverns and hidden rock monster hives. As long as its magma-core engine is fueled up and its huge spiked wheels keep turning, the Thunder Driller's powerful dual-direction drill never stops spinning! Motor shield opens to display gearing system and stored crystals! Includes 2 miners, rock monster and more! Combine with #8958 Granite Grinder to create the massive Aero Shredder! Vehicle measures 8" (20cm) long and has giant spiky wheels!