The Tapper® anchoring system is a family of screw anchors, specially designed drill bits and installation tools designed to meet the needs of most light to medium duty applications in concrete, block and brick. The Tapper® concrete screw anchor is produced in either hex washer head or Phillips flat head styles from Perma-Seal™ coated or zinc plated carbon steel and type 304 stainless steel. For heavy duty applications, the 3/8 in size is made in zinc plated carbon steel.