Red Head Hex Head LDT Tapcon Concrete ScrewThe Red Head Hex Head LDT Tapcon Concrete Screw is engineered to securely fasten medium high load applications into concrete, solid brick, hollow brick, or stone surfaces. Featuring a patented thread design and superior holding power, this concrete screw anchor offers superior performance in the most demanding applications. The Red Head Hex Head LDT Tapcon Concrete Screw is manufactured of steel with a zinc finish and is designed for concrete