Dottie 14P214 - 1/4" x 2-1/4" Phillips Flat Head Concrete Screw Anchor is made of carbon steel with a blue Xylan finish. Designed for close to edge fastening in poured and prestressed concrete, cinder block, or brick. Features include high-low thread type, case hardened construction, and easy loosening for adjustments. Comes in a sleeve of 500 anchors, with a gimlet point type and Phillips drive type. Pre-drill size of 3/16" x 4-1/2" and bit size of #2. Strong grip, corrosion resistance, and flat head design for a secure hold. Perfect for various applications with a diameter of 1/4" and length of 2-1/4".