These are the ST Racing CNC Machined Aluminum 12mm Hex Adapters for the Traxxas Slash 4x4, Stampede 4x4, and 1/10 Rally 4WD in high-quality blue anodized aluminum (1654B). Since these 12 mm hex adapters are manufactured from anodized aluminum, you dont have to worry about any rounding off under power loads and heavy torque. A set screw within the hex adapter tightens down over the axle so its held securely in place. RC Hobby Explosion carries a full line of ST Racing upgrades for all your favorite Traxxas vehicles, plus we have the best parts pricing on the Internet! FOR USE WITH: Slash 4x4 Stampede 4x4 1/10 Rally 4WD