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Please help improve this article by adding citations to reliable sources. Unpunched smooth surface grating is also available for special applications.This article needs additional citations for verification. The aluminum grating is made from type 5052 aluminum with a thickness of 0.080". United Interlock steel grating is made from pre-galvanized steel which conforms to a G-90 thickness designation per ASTM A653. This prevents dirt, debris, ice, and snow from building up on the surface and allows light and air to pass through. Punched Interlock Grating has an open area of 42% for 9" grating and 35% for 6" grating. Dieformed teeth in the transverse ribs give you 360° of shoe-gripping traction even when the grating is wet, oily, muddy, or icy. Anti-skid is the ideal choice when safe walking conditions are important. Steel Manufacturing Plant Locations - Dietrich Metal Framing exclusive manufacturer of SLP-TRK 500 Grant Street/Suite 2226 Pittsburgh, PA 15219 Phone: (412) 281-2805 E-mail: Dietrich Metal Framing, Inc. Two standard surfaces are available: slottedsmooth and anti-skid. The male-female legs of the roll-formed grating interlock securely, and double-male legs provide a safe finished edge for end planks. United Interlock Grating is engineered with a strength-to-weight ratio that allows it to withstand substantial loads while being easy to handle.