Dottie 36H314 - 3/16'' x 3-1/4'' Slotted Hex Washer Head Concrete Screw Anchor is made of carbon steel and designed for close to edge fastening in poured concrete, prestressed concrete, cinder block, brick, and mortar. Features a corrosion-resistant blue Xylan finish, strong grip, and can be loosened for adjustment. Comes in a sleeve of 500 anchors with a high-low thread type, hex head, hex/slotted drive type, and gimlet point type. Pre-drill size of 5/32'' x 5-1/2'', anchor length of 3-1/4'', hex size of 1/4'', and bit size of #2. Blue color with a concrete screw anchor type and 3/16'' diameter.