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Justrite Black, 543S0035BL A large hole drainage system facilitates the removal of liquid and debris from the work area. | Justrite Black, 543S0035BL Ramp System for greater ease onto or off of the mat. Cushion-Tred™ is made from a resilient rubber compound that can withstand many of the commonly found industrial chemicals, cutting fluids, oils, and greases. Design is compatible with the Notrax® M.