Wheel locking nuts are a great accessory for mounted spare wheels. They have a unique drive head on the top of the wheel nuts which prevents just a standard 19mm socket drive being used. To use the wheel locking nuts it requires the key piece (2nd Photo) and requires a 21mm socket drive.

$35(Incl GST)

Wheel Lock Nuts Main
Wheel Lock Nuts Main

Wheel Lock Piece
Wheel Lock Piece

Mounted Spare Wheel with Locking Nuts 2.
Mounted Spare Wheel with Locking Nuts 2.

Wheel Lock Nuts Main
Wheel Lock Nuts Main

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LOCKING WHEEL NUTS