Supertech valve guards.Newly redesigned and now fully CNC machined for a higher quality and finer finish. Fits: BMW S42 / M42 / M50 / S50 / S52 / M52 / M54 / 1.8 / 2.5 L (16v) / 2.8-3.0 L (24v) References: Triple Groove Supertech valve locks.Newly redesigned and now fully machined on CNC for higher quality and more accurate finish.Fits: BMW S42 / M42 / M50 / S50 / S52 / M52 / M54 / 1.8 / 2.5 L (16v) / 2.8-3.0 L (24v) References: triple groove