About SKU - (Stock Keeping Unit) SKUs are unique identifying codes for each of the items we offer. We created our SKUs based on various GLASS characteristics of our products. We use them as a system to differentiate BLACK SERIES and categorize our products efficiently. You can request a specific model by referring to its SKU. Single Swing G180B-1-3 Pedestrian G180-1-3 Double Swing G180B-2-3 Double Swing G180-2-3 Sliding G180B-S-3 Sliding G180-S-3 Overhead G180B-O-3 Overhead G180-O-3 Fence F180B-F-3 Fence F180-F-3 Panel P120-F-25 Panel P180-F-25 2 ROWS 3 ROWS Pedestrian G180-1-2 Pedestrian G180-1-5 Double Swing G180-2-2 Double Swing G180-2-5 Sliding G180-S-2 Sliding G180-S-5 Overhead G180-O-2 Overhead G180-O-5 Fence F180-F-2 Fence F180-F-5 Panel P180-F-25 Panel P180-F-25 4 ROWS 5 ROWS Pedestrian G180-1-2 Double Swing G180-2-2 Sliding G180-S-2 Overhead G180-O-2 Fence F180-F-2 Panel P180-F-25 6 ROWS 22