Projection varies by style: listed measurements range from 3 5/32" up to about 5" from the wall.
Some listings are sold as a single holdback, while others are offered as a set of two.
One listing shows a mounting plate diameter of 2"; other listings list overall dimensions such as 7" high by 9" wide by 1" deep.
Available finishes listed across the results include Black, Glossy White, Bronze, Brushed Steel, Antique Brass, Antique Gold, Silver, and Pewter.