What about slots and/or drill holes? The direction of Slots and/or Drill Holes does not determine rotational direction. Depending on the manufacturer, the slots or holes could lean either direction. If the rotors have straight cooling vanes, they can be installed on either side. Are drilled and slotted rotors better
Pros: Cost: It is sometimes cheaper to replace the rotor than to resurface the rotor. You can get after-market brake rotors for a fairly low price, making it more cost-effective than either spending time doing the labor of resurfacing yourself or hiring and paying someone else to resurface your rotors.