IRANCH IRGPM Ground Protection Mat, Black, 4FT (W)X8FT(L) DIAMOND PLATED/ SMOOTHPLATE TREAD DESIGN. Dimensions: 4 feet wide x 8 feet long x 0.5 inch thick. Made of high-density polyethylene (HDPE). mat weights 95 pounds and has a working load limit of 80 tons when evenly distributed.