551-The M.D. Ramp System® is designed for use with the Cushion-Ease® family of floor mats and provides a 2" beveled edge for easy access onto or off of the work platform. 552-The M.D.-X Ramp System™ is designed for use with the Custom-Ease® family of floor mats and provides a 6" longer gradual beveled edge for greater ease onto or off the work platform. Both 551 and 552 are made from 100% nitrile base rubber compound. M.D. Ramp Systems® provide the highest resistance to chemicals, cutting fluids, animal fats, oils and greases. All ramp lengths fit the male/female interlocking system on the mats and are beveled and molded with mitered corners and a protruding tab locks together the two adjoining ramps for a secure, professional corner. Square edges can be achieved by trimming off the miter using the cut line on the bottom of the ramp. FOB Shipping Point.