HI-TECH 45° SERIES About SKU - (Stock Keeping Unit) SKUs are unique identifying codes for each of the items we offer. We created our SKUs based on various characteristics of our products. We use them as a system to differentiate and categorize our products efficiently. You can request a specific model by referring to its SKU. Pedestrian G175-1-1 Double Swing G175-2-1 Sliding G175-S-1 Overhead G175-O-1 Fence F175-F-1 Panel G120-1-25 Floating 52