Key Features Easy to assemble and use robot chassis platform Kit includes all the hardware and tools necessary for assembly Give your robot a fast four wheel drive platform with plenty of room for expansion 48:1 DC gearbox This is the Multi-Chassis Basic 4WD Kit, an easy to assemble and use robot chassis platform. The Multi-Chassis kit provides you with everything you need to give your robot a fast four wheel drive platform with plenty of room for expansion to add various sensors and controllers. All you need to do is supply is a basic motor driver and power and you'll be ready to drive!This Multi-Chassis Basic 4WD Kit includes four 48:1 DC gearboxes that independently drive each of the 65mm low-profile wheels. Each side of the 2.5mm thick aluminum frame comes cut with plenty of attachment points to add a multitude of different robot controllers, drivers, and sensors.Item Specifics1x Aluminum Frame4x 65 mm Diameter 48:1 DC Gearbox4x Low-Profile Wheel4x M3 25mm Standoff6x M3 8mm Screw4x M2.5 25mm Screw4x 2.5 20mm Screw8x M3 8mm Screw8x M2.5 Nut2x M3 Nut1x 5 AA Battery Holder1x Spanner1x Screw DriverCompleted Kit Size - 165L x 157W x 65H mmWheel Diameter - 65 mmBasic robotics skills requiredSome DIY skills neededBasic electrical prototyping skills requiredBatteries not included