These are the ST Racing Concepts CNC machined aluminum hex adapters for the Traxxas Slash 4x4 1/10 truck.
Features: The 12mm Machined Hex adapter securely mounts on your Slash 4x4 tires and wheels with no chance of it being rounded off under heavy torque and power loads. Setscrew on the hex adapter securely holds it in place over the axles. These adapters are blue in color.
Includes: Four hex adapters
Width: 12mm (15/32)
Height: 5.5mm (7/32)
Hole diameter: 5.5mm (7/32)