Swanson Speedlite Series TO118 Square, 8 in L, 8 in W

The 8 in Speedlite square is formed from lightweight, high-impact structural composite and is available in matte gray, high-visibility yellow and high-visibility orange. It's basically the same as the one and only Speed square but is also great for use with siding and other delicate materials, since it won't mar soft finishes. Plus, its 8 in size means it's ideal for marking cuts in 8 in siding. Look for the Diamond.