This is a pair of XT5-6Lug aluminum hubs, a six-lug hub specially designed for Boom Racing 1.55" ProBuild wheels. This hub uses the XT5 center cap system, with a six-lug bolt pattern. The XT5-6Lug hub bolts are less spaced out than the XT6 six-lug hub bolts for a more realistic scale look.
Made of billet CNC aluminum.
This hub does not require wheel hex, it uses a pin to secure directly on the drive shaft.