This is a replacement fastener kit for the front and rear C5/C6 wheel bearings. This kit uses 12 point reduced head grade 12.9 (175, 000 PSI) M12 cap screws, Nordlocs, and an M14 nut with Nordloc for the lower ball joint. Can be used with the OE or our new SKF bearings. The OE Torx head bolts loosen, and the head strips out. With these you use a standard 12mm 12 point socket and they allow proper torque for greater reliability and ease of assembly and removal. Can be used many times. This kit is compatible with brake ducts that have a 1/8 thick flange.