Product Information. SLIPNOT Surfaces: Steel, Stainless Steel, and Aluminum. Grating is Available in: Grade 1 (Fine), Grade 2 (Medium), and Grade 3 (Coarse – Steel surface only) SLIPNOT Finishes: Mill, Painted, or Galvanized Steel. Stock Length and Widths (maximum 36” panel width): 2’x20’. 2’x24’.