Dottie 14P314 - 1/4'' x 3-1/4'' Phillips Flat Head Concrete Screw Anchor is a carbon steel anchor designed for close to edge fastening in poured concrete, prestressed concrete, cinder block, brick, and mortar. Featuring a strong grip, corrosion resistance, and case hardened construction, this anchor is ideal for applications requiring adjustment or removal. With a blue Xylan finish, high-low thread type, flat head design, Phillips drive type, and gimlet point type, this anchor comes in a sleeve of 500 with a pre-drill size of 3/16'' x 5-1/2''. Its anchor length is 3-1/4'' and anchor diameter is 1/4'', requiring a #2 bit size for installation.