The Camco RV Aluminum Stack Jack Stands are designed to help you achieve secure and level RV positioning and stability. Made from durable cast aluminum, each stand can support up to 6, 000 lbs. Jack Stands extend from 11" to 17" high and are easy to use. Comes in a set of 4 stack jacks.• Designed to secure and level RV positioning and stability• Each jack supports up to 6, 000 lbs.• Durable cast aluminum construction• Extends from 11" to 17" high• Set of 4 jack stands Each jack supports up to 6, 000 lbs. Adjusts from 11"" to 17"" high | Camco Aluminum Jack Stands, Set of 4