2 Results. 1. McNICHOLS® Plank Grating. Heavy-Duty Walkway, GRIP STRUT®, Galvanized Steel, ASTM A-653 G90, 10 Gauge (.1382" Thick), 8-Diamond (36" Width), 5" Channel Height, Serrated Surface, 48% Open Area. Item: 24U8501012. Size (s): 36" x 144". McNICHOLS® Plank Grating. Heavy-Duty Walkway, GRIP STRUT®, Galvanized Steel, ASTM A-653 G90, 10