Well now, what do we have here? These special axle nuts are actually hardened steel and have a built in re-threading feature which means your axles won’t strip when using. These come standard on all AF1 models, but you can upgrade your Classics by grabbing 1, 2, or a make it a full setup with 4 (enough for 2 trucks). If you haven't yet set up your Ace trucks, these'll also work on all other trucks out there.