If you have a truck bed cap or tonneau cover and want to keep out dust and water from your truck bed but occasionally use your truck for transporting loose material, then this is the solution. ROK BLOCK installs over the tailgate bottom gap and patented Ultimate Tailgate Seal with Taper Seal installs on the sidewalls. Both seals adhere using 3M ST1200 tape. For bed and tailgate liners ROK BLOCK installs under the liner. To buy ROK BLOCK only purchase ASIN: B00BPE4AP6. PARTS IN THIS COMBO KIT ARE NOT COMPATIBLE WITH THE FOLLOWING PICKUPS: Chevrolet Silverado (buy ASIN: B075PWVW67 and B08R7NNV2B), Chevrolet Colorado 2023 and newer (buy ASIN: B08WDQN5CB and B075PWVW67), Chevrolet Silverado with Multi-Flex Tailgate (buy ASIN: B075PWVW67 and B085896S8R), 2021 and newer Ford F Series trucks with a hinge retainer bracket (buy ASIN: B075PWVW67 and B0B5Y9MFCK), Ford Lightning (buy ASIN: B075PWVW67 and B0B5Y9MFCK), Ford Maverick (buy ASIN: B00BPE4AP6 and B0BWV7HJMZ), Ford Ranger 2019 and newer (buy ASIN: B075PWVW67 and B07YF5BL8M), Ford Raptor (buy ASIN: B00BPE4AP6 and B0B5Y9MFCK), GMC Sierra (buy ASIN: B075PWVW67 and B08R7NNV2B), GMC Canyon 2023 and newer (buy ASIN: B08WDQN5CB and B075PWVW67), GMC Sierra with MultiPro Tailgate (buy ASIN: B075PWVW67 and B085896S8R), Nissan Frontier (buy ASIN: B075PWVW67 and B09F4D4YPG), Nissan Titan (buy ASIN: B00BPE4AP6 and B08YRZB3H3), RAM 2500 and 3500 (buy ASIN: B075PWVW67 and B00IPQWXZQ), RAM with RamBox (buy ASIN: B075PWVW67 and B08L21DGNB). For all pickups/utes outside the U.S. market buy ASIN: B076NFYH2R. Excluded Pickups (4) for both ROK BLOCK and ROK BLOCK XL: Honda Ridgeline with Dual Action Tailgate, Hyundai Santa Cruz, RAM with Multifunction Tailgate and Ford with Pro Access Tailgate. Apply when the air and surface temperature is between 50° - 104°F (10° - 40°C). This product requires 25 lbs. of pressure to bond adhesive. Patents issued and pending. MADE IN USA.