Are you talking about the stud? If so...

you should have done it yourself. Learn more that way. Take off the caliper and rotor. The stud is easy to get to, hammer out the old one, put in the new one, take a normal bolt tighten it all the way down, take off bolt, reasembly rotor and caliper, and your on your way. But for $15 why waste your own time and energy.