When I wore the Napa Ultra Premium shoes (highest model), my shoes kept readjusting when the parking brake was applied. This caused my drum to develop a crack that would allow the bolt to pull it off. I went back to OEM shoes and used Brembo drums. After using the brake 70 times after adjusting the shoes, so far there has been no over-adjustment. Only use OEM or you'll ruin your drums and boil your brake fluid like I did. It also comes with an E clip and a C clip.