Rhino Mats DTT3648B Diamond Plate Anti-Fatigue Mat, 3' Width x 4' Length x 9/16" Thickness, Black The heavy duty style is 9/16-inches thick Diamond plate anti-fatigue by rhino is the benchmark for comparison to all other industrial anti-fatigue mats This strong performer suffers no deterioration from weathering and ozone exposure and is selft-extinguishing when tested in accordance with FMVSS-302 These mats offer excellent durability following exposure to many organic and inorganic industrial chemicals 3 year warranty