Simpson Strong-Tie® mechanical anchors are designed to install easily and securely into a variety of base materials, including concrete, grouted and hollow CMU and brick. Specifiers and contractors trust Simpson Strong-Tie anchors for optimum performance under the most demanding structural applications. The stainless-steel Titen screws attach various types of components to concrete and masonry in environments where a medium level of corrosion resistance is required. Available in hex and Phillips head, Titen screws are designed for use with appropriately sized drill bits that are included with each box. Titen® 1/4 in. x 3-3/4 in. Phillips Flat-Head Stainless-Steel Concrete and Masonry Screw (100-Qty) (Pack of 400).