Easy to use: 6" lift height to change tires on a tandem axle trailer without a jack Heavy Duty: For trailers up to 35,000 lbs in weight with tire sizes up to 32" Sturdy and Durable: Made of premium polymers; Added anti-aging and UV-resistant materials; Anti-UV additives slow the aging of these levelers Double Anti-slip Design: The leveler and chock have a precise gear mesh design to prevent slippage between them; They still come with thickened rubber non-slip pads Why Choose Us: OULEME specializes in the production of automotive tools and accessories. We DO NOT sacrifice quality for the price OULEME Curved Trailer Tire Lifter Leveling Blocks