ST Racing Associated MT12 Aluminum HD Steering Knuckles. Designed to upgrade the Team Associated MT12 front axle, these knuckles provide superior strength and rigidity. Constructed from CNC machined aluminum and using a hard anodized coating, these can hold up to extreme conditions and stay looking great over the long run. Add strength and reliability to your rig with these heavy duty steering knuckles. Package includes two aluminum HD steering knuckles.