This power feed was junk. You must feed your house wire into the canopy then secure to screws on the inside. Ground cord broke off. Do yourself a favor and go to Lowes or Home Depot for this part. Theirs have "pigtail" wires coming out from the canopy. They're color coded and even include wire nuts. You'll have to settle for black or white though...no silver.
I was very disappointed with the appearance and quality of the product. It was a shiny plastic piece that looked cheap. The construction of the wire connectors was flimsy that has a tendency to break. It was also very expensive for what you get.