Safety device to use with ramps or other lifting devices Prevents tires from rolling Stackable, nestable design for easy and convenient storage Constructed of heavy duty resin material for ultimate durability and long-lasting usage Not for commercial use Includes two wheel chocks (one pair) FloTool, by Hopkins Manufacturing, offers the most comprehensive and highest quality offering of fluid handling products. Driven by innovative, no-mess product solutions, whether you’re changing your oil, topping off the antifreeze, or checking all your automotive fluid levels, FloTool has the right application. FloTool's Heavy Duty Wheel Chocks are a much needed safety devices when maintenance your vehicle or trailer. Heavy duty resin construction, designed to last.