Rejuvenator® 502.58X3X5BK 502-M Heavy Duty Solid Anti-Fatigue Mat, 5 ft L x 3 ft W x 5/8 in THK, Polyurethane, Raised Square Surface Pattern Rejuvenator® 502.58X3X5BK 502-M Heavy Duty Solid Anti-Fatigue Mat, 5 ft L x 3 ft W x 5/8 in THK, Polyurethane, Raised Square Surface Pattern