WorkRite® by Wearwell® 474.12X3X5BK Grease Resistant Anti-Fatigue Mat, 5 ft L x 3 ft W x 1/2 in THK, Natural Rubber, Raised Circles Surface Pattern WorkRite® by Wearwell® 474.12X3X5BK Grease Resistant Anti-Fatigue Mat, 5 ft L x 3 ft W x 1/2 in THK, Natural Rubber, Raised Circles Surface Pattern