Installing Single Expansion Anchors can be completed in four easy steps. These light to heavy duty anchors can be used when working in concrete, brick and block base material, and can even be used in soft masonry and base materials of questionable strength. A machine threaded bolt is used to expand the Single Expansion Anchor and can be removed and replaced without affecting the holding values of the anchor. The Single Expansion Anchor is available in 1/4", 5/16”, 3/8”, 1/2", 5/8” and 3/4” diameters. The Single Expansion Anchor is made from a highly corrosive zinc-based alloy called Zamac.