Lynx Levelers leveling blocks are designed to withstand tremendous weight for most leveling or stabilizing functions. To use: simply set them into a pyramid shape to the desired height that the RV needs to be raised and drive onto the stack. The levelers can also be used as a support base for other stabilizing equipment. Use under single and dual wheels, under tandem axles and under jacks. Unique Features Modularly designed levelers not only configure to fit any leveling function, but they also withstand tremendous weight To use: simply set them into a pyramid shape to the desired height that the RV needs to be raised and drive onto the stack Conveniently packaged and easily stored in a durable nylon bag The levelers can also be used as a support base for other stabilizing equipment Strong and durable Easy to use interlocking blocks Replace unreliable wood blocks Economical *Additional charges for shop supplies/shipping may apply