EACH PLASTIC SHELF MAT IS SUPPORTED ON ALL SIDES BY A STEEL SHELF COLLAR FOR AN IMPRESSIVE 400 LB. SHELF CAPACITY. STURDY STEEL FRAME IS PROTECTED BY GLOBAL'S PREMIUM QUALITY EXCLUSIVE NEXELON FINISH TO WITHSTAND WET HOT OR COLD EXTREMES IMPACTS AND CHEMICALS. IT'S SO TOUGH WE INCLUDE A LIFETIME GUARANTEE AGAINST CORROSION. STEEL SURFACES ARE ALSO FINISHED WITH NEXGARD. REMOVABLE PLASTIC SHELF MATS RESIST CHIPPING AND CORROSION AND INCLUDE VENTS TO INCREASE AIR CIRCULATION AND LIGHT PENETRATION. THEY'RE ARE REMOVABLE DISHWASHABLE AND TO CHIPPING AND CORROSION. SHELVES EASILY ADJUST AT 1"" INCREMENTS FOR PRECISE SHELF ALIGNMENT. INCLUDES 4 BLACK PLASTIC SNAP-ON SLEEVES FOR EASY INSTALLATION AND ADJUSTMENTS. 400 LB SHELF CAPACITY.