These are the optional 17mm Aluminum Hex Adapters for the Tekno RC M6 Driveshaft used on the Traxxas Slash 4x4 and 2WD. FEATURES: Aluminum construction INCLUDES: 2 Hex adapters 2 Lock Nuts 2 Axles 2 Pins 2 Set screws REQUIRES: Installation on vehicle JMLM 3/10/11 ir/jxs