SCX-6 brass heavy steering knuckle (Black color)The Samix SCX 6 Brass Heavy Knuckle Set (SCX6 4412BK) is the perfect upgrade for your SCX 6 crawler. The brass heavy knuckles add a total of 513g of bottom weight, which improves climb performance, stability, and lowers the center of gravity. The set includes heavy duty 8x19x6mm outer bearings that not only add weight but also help with longevity. The knuckles are made of high quality CNC machined solid brass material and come with the SAMIX word and