BC Racing lock rings are manufactured of 6061-T6 aluminim. Each lock ring is sandblasted and then anodized to protect the ring from corrosion. This lock ring is the lowest locking ring.
Most kits are fitted with 53mm lock rings, if you are not sure about the correct size, don't hesitate to contact us or you can also choose the option "Don't know correct size, I specify my car model on the order" and then just type your car model on the order message and we will then check automatically the correct lock ring for you.