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The Model 10 Series is Handed or Non-Handed. Single or Double Acting. This Closer will be a T4,T6, or a T8. These numbers represent the number of springs inside the closer so the higher the spring number the stronger the closer. They also come in 100, 105, 110, 115, 120, 125, 150,155, 180,and 185 degrees.
The shaft on this closer is twisted so you won’t be able to tell the correct degree or if it is a hold open.