The width of the handrail needs to be a certain width to be considered graspable. OSHA requires that the handrail be 1 1/4 to 2 inches in diameter for a round handrail. If the handrail is not round, then the handrail's perimeter should be 4 to 6 1/4 inches.
If the handrail is not round, then the handrail needs to have a finger groove that is 3/4 inch down from the tallest point of the handrail. The handrail groove needs to be 1 1/4 to 2 3/4 inches wide.
Spacing from the Wall
The graspable handrail needs to be 1 1/2 inches from the wall so you can grasp it easily without scraping your knuckles against the wall. If the handrail is too close, it's not considered a graspable handrail.