Camco's Curved Trailer-Aid with Chock and Pad helps you easily change a tire on a tandem axle trailer without a jack. It offers 6 1/2" of lift for safe and simple tire changing. Designed for trailers up to 20,000 lb and compatible with tires up to 32" in diameter, it supports up to 9,000 lb. This product includes (1) Curved Trailer-Aid, (1) wheel chock, and (1) rubber base pad for traction. The Curved Trailer-Aid measures 10" tall x 19" wide x 5 3/4" deep (in-use overall dimensions). It features a heavy-duty honeycomb design and is made of durable plastic with UV inhibitors. A convenient carry handle provides easy transport.