A tough PVC based workstation mat developed by NOTRAX over 30 years ago to be a truly Superior mat. Hundreds of portholes facilitate drainage while the worker is elevated on a series of traction blades to help resist slippage and keep the worker out of the spillage. Six-inch wide diamond-studded beveled ramps are perma- nently affixed on 3 sides and perforated for drainage. Full 7/8 inch thickness. Offered in 4 versions to fit the most demanding environments:#522 HD Cushion-Lok Heavy-Duty with Grip-Step : Same as #520HD but with a thick gritted layer applied to the top surface for extremely slippery environments.