12mm 15mm Wheel Spacers For BMW 1 2 3 4 5 6 Series F10 F20 F21 F22 F30 F31 F32. Forged 6061 aerospace-grade Aluminum alloy with 10.9-grade bolts makes the spacer tough and more durable in use. If the length of the vehicle bolts exceed the thickness of the wheel spacers, you need to cut the vehicle bolts.
