Improve your staircase projects with this Simpson Strong-Tie stair thread angle. The staircase angle is available in a variety of sizes and thicknesses. With its corrosion-resistant properties, this stainless-steel angle maintains structural stability for a long time. This angle installs easily with #9 x 1 1/2 in L screws. The angle measures 1 1/2 in W x 10 1/4 in L x 1 1/2 in H.