Color (Duplicate): Silver Color: Silver Condition: New Diameter: 1/4″ Drive Style: Hammer Head Type: Dome Head Finish: Zinc Plated Head Style: Dome Length: 3″ Material (Duplicate): Zinc Plated Steel Material: Steel Part Number: 046737837380 Product Type: Hammer Drive Anchors Size System: US Size Type: Regular System of Measurement: Inch Tolerance (IFI): Actual measurements may vary slightly /- depending on production run within IFI Tolerances Weight: 1 lb Using a pre-drilled hole, they are installed with hand tools (typically a hammer) Drive the pin into the anchor body, expanding the anchor, to form a tight fit Zinc plated steel adds a layer of corrosion resistance A zinc plated steel Hammer Drive Pin (or just drive pin) attaches fixtures to solid concrete or certain types of concrete blocks. They are also sometimes referred to as mushroom head anchors, nail in anchors, or drive nail anchors.