The Camco FasTen XL Leveling Blocks allow you to stack the interlocking blocks to the desired height for safe and easy leveling. The new, larger size has an increased weight capacity and also provides more surface area for leveling. Each block adds a full inch to stack height. Camco FasTen XL Leveling Blocks can be used with single wheels, dual wheels, hydraulic jacks, tongue jacks, stabilizer jacks, 5th wheel jacks, and tandem axles. The convenient carrying handle secures blocks together for storage and easily pulls up for carrying or pushes down for more compact storage. Individual block measures 10.5" x 10.5" x 1.5". Stack height should not exceed 4.5".• Larger 10.5" x 10.5" design withstands more weight and creates more surface area for leveling• 10 interlocking blocks stack to the desired height for customizable leveling• Carrying handle easily twists to secure blocks together for storage• Strong and durable construction• Safe and easy to use Convenient carrying handle secures blocks together for storage Safe & easy to use Each block measures 10.5"" x 10.5"" x 1.5"" | Camco FasTen XL Heavy-Duty Leveling Blocks, 10-Pack