Dottie 14H400 - 1/4'' x 4'' Slotted Hex Washer Head Concrete Screw Anchor is made of carbon steel with a blue Xylan finish for corrosion resistance. Designed for close to edge fastening in poured concrete, prestressed concrete, cinder block, brick, and mortar. Features include strong grip, case hardened construction, and easy loosening for adjustment or removal. Ideal for high-low thread type, hex head type, and hex/slotted drive type. Comes in a pack of 500 with gimlet point type, blue color, 3/16'' x 5-1/2'' pre-drill size, 4'' anchor length, 5/16'' hex size, #2 bit size, concrete screw anchor type, and 1/4'' anchor diameter.