The Rock Solid Tow Guard is the effective way to reduce the costly damage that road debris can cause to your towed vehicle. Rock Solid Guards are made of exhaust heat resistant rubber. This new material is 3/8" thick vulcanized molded rubber that is impervious to extreme exhaust heat and won't melt or deform. The Rock Solid design allows air to flow through the vented flaps to allow flexibility and prevent heat build-up, but it's sturdy enough to stop rocks or small road debris. These Rock Solid Guards install easily onto your RV. This Rock Solid Protective Guard consists of two 20"H x 48"L pieces that permanently mount to the rear bumper of the RV. Trim or eliminate strips to accommodate mufflers, hitches, or wiring. Mounting brackets are galvanized steel. Installation may require some drilling. Measuring Instructions: Measure from bumper to ground and subtract 4" to determine correct height. Note: This item should attach directly to a metal bumper, but may require some drilling. For any other application, you may need additional hardware (sold separately). Vented flaps allow flexibility & prevent heat build-up Installs easily on your RV Two 20""H x 48""L pieces | Smart Solutions Rock Solid Tow Guard for RVs, 20" x 48", 2 pieces