These are the optional Carbon Reinforced K & KK Parts for the Tamiya XV-01, and XV-01 Pro Chassis Cars. Replaces stock plastic steering arms and battery hatch Carbon reinforced parts provide greater rigidity, and improved handling on high traction surfaces Carbon Reinforced K & KK Parts Tamiya #54232 M3 x 0.5 Forming Tap #74086 modeling Drill Chuck jxs 01/17/14 ir/jxs &