Flip Socket For installing wheels and spacers this is the right tool for the job.
Details:

• 19.0 mm on one end and 21.0 mm on the other
• Thin wall socket
• 0.5 Inch drive
• Socket is rated for use with an impact gun

Specs:

• Warranty: 12 Month Limited Warranty
• Sold As: Each
• Material: Metal
• Finish: Bare
• Color: Grey
• Fits: Non-vechicle specific