Style A—Style A holders have a wide top opening so you can easily pull out your wheel chock. They also have openings on each side to accommodate chocks that have eye bolts or chains on the ends.

Style B—Style B holders have a wide top opening so you can easily pull out your wheel chock. They also have openings on each side to accommodate chocks that have eye bolts or chains on the ends and they have a sign reminding drivers to chock their wheels.

Style C—Style C holders have a narrow top opening for a tight fit and a support bar on the bottom to keep wheel chocks from falling through. They’re often mounted to vehicles because they’ll keep chocks from jostling and falling out during movement.