From the Manufacturer Red Head Tapcon Hex Washer Head 1/4 X 2-1/4 Inch Anchor is the "original masonry" anchor that cuts its own threads into concrete, brick, or block. Maximum performance is achieved because the Tapcon Anchor, the Condrive Installation Tool, and the carbide-tipped Tapcon Drill Bits are designed to work as a system. It is essential to use the Condrive tool and the correct drill bit to assure consistent anchor performance. The Hex Head style on Tapcon Anchors is available for majority of fixture anchoring needs and works in all masonry base materials. The Climaseal Coating is standard on all Tapcon anchors to provide extended corrosion resistance. Advanced thread form cuts into masonry materials for greater stability and pullout values Lengths of Tapcon Anchors range from 1-1/4 inch to 4 inch in 3/16 inch and up to 6 inch 1/4 inch diameters. Nail-Type Point guides the anchor into the pre-drilled hole, so no hole spotting or inserts are required. These anchors install fast and easily (three anchors per minute), and are excellent for wood to concrete applications. Specs: Fixture Thickness - 3/4 to 1-1/4 inch; Bit Length - 4-1/2-Inch inches.