This is the optional Pro-Line PRO-2 Hinge Pin Set for the 2WD Traxxas Slash. FEATURES: Constructed of hardened steel with polished finish Secured with locknuts to prevent hinge pins from backing out INCLUDES: Six M3 Locknuts Two M2.5 Locknuts Two each; Front Outer Hinge Pins Rear Outer Hinge Pins Front Inner Hinge Pins Rear Inner Hinge Pins jxs 12/13/12 ir/jxs