A sister product to the Cushion-Lok #520 Series. This Series features a solid top/no perforation mat that can be interlocked with the #520 Series or used as a standalone mat. The worker is elevated on a series of traction blades that pro- vide sure-footing and comfort. Six-inch wide diamond-studded beveled ramps are perma- nently affixed and perforated for any incidental drainage. Full 7/8 inch thickness. Offered in 2 versions to fit the most demanding environments:#922 HD Cushion-Lok Heavy-Duty Solid with Grip-Step : Same as #920HD but with a thick gritted layer applied to the top surface for extremely slippery environments.