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, brick. The TAPPER concrete screw anchor is produced in either hex washer head or phillips flat head styles from Perma-Seal coated carbon steel and Type 304 and Type 410 stainless steel. The 3/8" size is made in zinc plated carbon steel.