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• Section 4.26.2 of the 1991 Standards requires handrail gripping surfaces to have a diameter of 1 ¼ inches to 1 ½ inches, or to provide an equivalent gripping surface. Section 505.7 of the 2010 Standards requires handrail gripping surfaces with a circular cross section to have an outside diameter of 1 ¼ inches to 2 inches. Handrail gripping surfaces with a non-circular cross section must have a perimeter dimension of 4 inches to 6 ¼ inches, and a cross section dimension of 2 ¼ inches maximum.

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