Tapcon  Concrete Screw Anchor  1/4 in. Dia *Diameter: .15 in. *Length: 1-3/4 in. *Material: Steel *Head Style: Hex Head*Product Type: Concrete Screw Anchor *Number in Package: 225 pk *Packaging Type: Bulk *Dimeter: 1/4 in. *Thread Type: High/Low *Application: Concrete and Masonry, Concrete Anchor *Hex washer head* Tapcon is the original masonry anchor designed for fastening applications in concrete, block, and brick* Use anchors to attach electrical equipment, two by fours,downspout straps, hose reels, flag poles, hurricane shutters, and more* The blue climaseal coating provides extended corrosion protection and makes anchors perfect for outdoor use