The Martin Industries Pickup Tire Xpeditors MPTX-50 and MPTX-100 are designed to fit most 6-1/2' and 8' pickup truck beds, including Ford F-150, GMC Sierra, and Chevy Silverado. The MPTX-50 is built to carry up to 50 tires of 17" in outer diameter, while the MPTX-100 can carry up to 100 tires with its overhead section on top of the cab. Both feature heavy duty locking systems and hinges, and use stainless steel clamps to fix the cage to the bed, preventing the need to drill holes. They are made with steel tubes designed to prevent water from leaking in and are covered with UV-resistant powder coated paint.