JConcepts 4mm locking wheel nuts
JConcepts has your 4mm locking wheel nut needs covered with the serrated wheel nut set. These high precision wheel nuts are flanged and serrated for locking security and feature a light-weight design. Intended for use with all Traxxas vehicles which use the 4mm wheel nut along with Associated SC10 4×4, TLR 22, 22-T and SCT-E.
Source: JConcepts [jconcepts.net]