Red Head Hex Head Sleeve AnchorRed Head Hex Head Sleeve Anchors are contractor grade fasteners designed for use in porous concrete, hollow blocks, grout filled blocks, and brick. They can be used to securely install handrails, window frames, partitions, cabinets, and pipe supports. Their hex head allows for easier tightening and greater torque. The Red Head Hex Head Sleeve Anchor is manufactured of steel with a zinc finish and is designed for concrete applications.