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Hot Racing Arrma Grom Aluminum Adjustable Motor Mount. This optional upgrade is intended for use on the Arrma Granite and Typhon Grom 1/18 Monster Truck and Buggy platforms. Precision-engineered to ensure a precise fit, this motor mount provides a lightweight solution that allows a much wider range of gear ratios. CNC machined from high-quality aluminum, this motor mount aids in heat dissipation and helps prevent the motor from overheating. The anodized finish adds a layer of corrosion resistance while providing a sleek look to your vehicle.