Simpson 1/4" x 40" Helical Stitching Tie 304 Stainless Steel HELIST254000The Simpson Strong Tie Heli Tie helical stitching tie provides a unique solution to the preservation and repair of damaged brick and masonry structures. Ties are grouted into existing masonry joints to repair cracks and increase strength with minimum disturbance. Made of Type 304 stainless steel, the Heli Tie stitching tie features radial fins formed on the steel wire via cold rolling process, increasing the tensile strength of the tie. Model No.