I just did my rear brakes today and let me say I got my moneys worth. Lol, metal on metal to the point were my rotors were dug in a good 1/8". Anyway, my rotors were held in by little metal clips that spun on the lugs. I didn't reuse them and don't hear the rotor rattling. Parts store don't have a listing for it. Was it something the last person did as a precaution or do they require them? Thanks