MQB models and most commonly the MK7 have nuts holding the ignition coil grounds down. This nut requires holding the bolt for the coil to remove it. Due to clearance issues between the coil bolt and the nut, an especially flat wrench is required to remove this part. Failing to properly hold this nut could result in damage to the ground wires for the ignition coils. Be sure to properly hold yours with this 10mm flat wrench.