Volvo Repair Questions? Ask a Mechanic for Answers ASAP
You will need to purchase a special socket, which has spiraled edges that grip, that is hammered onto each locking nut, then use a 1/2" ratchet and extension to remove them. The socket runs about $50 and is available from leading parts stores:
Your other choice is the run by a tire store and pay them to remove the wheel nuts.