Crown® Safe-Flow Plus™ KS 0035BK 648 Anti-Fatigue Mat, 5 ft L x 3 ft W x 3/8 in THK, Nitrile Rubber, Drainage Hole Surface Pattern, Resists: Water, Oil, Grease, Chemicals and Animal Fats Crown® Safe-Flow Plus™ KS 0035BK 648 Anti-Fatigue Mat, 5 ft L x 3 ft W x 3/8 in THK, Nitrile Rubber, Drainage Hole Surface Pattern, Resists: Water, Oil, Grease, Chemicals and Animal Fats