Hole size: 22 x 22mm, thickness 12mm. Flame retardant to DIN 4102. Resistant to mild acids and alkalis. Conforms to slip resistance test DIN 51097 Category B. Cross ribbed in both directions for added grip. Relieves operator fatigue. Gives a safe operating surface as debris falls through the matting. Reversible. Optional extras: Bevelled safety edging (factory fitted) and fixing blocks.