Hammer Drive Pins (or just drive pins) attach fixtures to solid concrete or certain types of concrete blocks.
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