The DEWALT 02820-PWR Zamac Nailin mushroom head hammer drive anchor is a light-duty fastening anchor for concrete, block, brick, masonry, and stone. It features a zinc-plated Zamac alloy body, carbon steel nail, and mushroom head design for dependable tamper-resistant anchoring. This 1/4 in diameter by 1-1/2 in long anchor is intended for general purpose anchoring and common applications such as roof flashing, mechanical attachments, brick ties and masonry anchorage, furring strips, electrical fixtures, and maintenance work. The pack contains 100 anchors.