Camcos Wedge Levelers level your RV, helping your appliances and tanks operate more efficiently. This set of (2) provides up to 3 ¼-inches of lift and measures 15 ½-inches (L) x 6-inches (W) x 4-inches (H). They are compatible with RVs that have parking brakes (i.e.: Class B and Class C). Not intended for use with trailers. A durable, UV-stabilized polymer construction and a unique honeycomb design provide enhanced strength. Patented.