When determining the length of a grab bar needed, keep in mind that the overall length of the grab bar is about 3 inches longer (3.125 - 3.25 inches depending on the style of bar) than the name of the bar. So a 16 inch grab bar would measure about 19 inches end to end with the points for attachment 16 inches apart.
16 inch grab bars are a popular choice. These bars install horizontally with ease to provide a strong handhold inside the shower. They are also frequently installed vertically at the entrance to showers and tubs where bathers are likely to lose their footing. While installation into studs is always ideal, state of the art Snaptoggles and Secure Mount Anchors can make any installaltion in a hollow wall easy even if you can't locate the studs. All of our 16 inch grab bars meet or exceed ADA guidelines for safety in the bathroom.