Simpson Strong Tie TTN25334PFSS 1/4-Inch by 3-3/4-Inch Grade 410 Titen Concrete and Masonry Screw with Phillips Head, Stainless Steel by Simpson Strong-Tie. $77.99. From the Manufacturer                Titen concrete and masonry screws are 3/16-inch and 1/4-inch diameter hardened screws for attaching all types of components to concrete and masonry.  Available in hex and phillips head designs in standard blue, white and 410 stainless steel.  Use with appropriately sized Titen dri...