Drive the pin into the anchor body, expanding the anchor, to form a tight fit Using a predrilled hole, they are installed with hand tools, typically with a hammer strike, to drive the pin into the anchor body expanding the anchor to form a tight fit. The washer on the anchor retains the pin and guides it during the driving installation. Anchor Diameter Equals Hole Diameter-Makes it easy to determine hole size Zinc plated steel adds a layer of corrosion resistance