The Camco Curved Trailer Aid with Chock and Pad helps you easily change a tire on a tandem axle trailer without a jack. It offers 6 ½-inches of lift for safe and simple tire changing. This product is designed for trailers up to 20,000 lb and works with tires up to 32-inches in diameter. It includes (1) Curved Trailer Aid, (1) wheel chock, and (1) rubber base pad for traction. The Curved Trailer Aid measures 10-inches tall x 19-inches wide x 5 ¾-inches deep (in-use overall dimensions). It features a heavy-duty honeycomb design and is made of durable plastic. A convenient carry handle provides easy transport.