This is the 12mm lock-pin type hex hub from ST Racing for the Traxxas Stampede, Rustler, Bandit, Slash and Nitro Slash.
Using high quality CNC machined aluminum, these Lock-pin style aluminum wheel hex locks down on the axle pins so loosing pins are no longer a problem for your Traxxas electric Stampede/Rustler/Bandit or the new Slash. Aluminum hex are also more durable and less likely to strip out and provides a better fit to the wheel hex.
Features: These are gun metal gray in color
Width: 12mm (15/32)
Thickness: 6mm (5/16)
Diameter of Hole: 5.5mm (7/32)