Feature: 1. Applicable Model: This 313mm wheelbase RC chassis frame with prefixal shiftable gear box is designed for Axial SCX10 1/10 RC crawler cars. 2. 2 Transmission Options: Using a 3 channel transmitter and micro servo, you can control the RC metal chassis on demand in one of two ways. 3. 2 Speed Mode: RC chassis is equipped with a shiftable gear box and micro servo. The 2 speed mode can be selected, and the gear box can be set to 2 speed using high gear and low gear. 4. 313mm Wheelbase: Smooth transmission system, 313mm wheelbase chassis, front gear box design, easy to install the body shell. 5. Aluminum Alloy: Made of aluminum alloy, wear resistant and durable, this 313mm wheelbase RC chassis frame is practical and sturdy RC crawler upgrade accessories. Specification: Item Type: RC Metal Chassis Frame Main Material: Aluminum Alloy Gross Weight: 878g / 31.0oz Color: Black and silver Product Length: 435mm / 17.1in Wheelbase: 313mm / 12.3in Width: 76mm / 3.0in Gear Ratio of Gear Box: 1:8 Gear Ratio of Transfer Case: 1:1.2 Applicable Model: For Axial SCX10 1/10 RC car. Package List: 1 x RC Metal Chassis Frame