BlueSpot 4 Way Wheel Wrench (17-23mm) The BlueSpot 4 Way Wheel Wrench (17-23mm) is a heavy duty product specifically designed for the tightening and removal of wheel nuts. The wrench features the following sizes: 17, 19. 21 and 23mm. To activate the manufacturers lifetime guarantee, you will need to register the product on the Bluespot website within 30 days of purchase.