The Izzy Swan Straddle Square is Made in America from polished T6 aluminum. It is precision milled, then anodized and laser-etched for long life. It uses a 303 stainless steel shoulder screw to actuate the yoke and straddle. You can quickly and easily mark 90° and 45° angles on three sides of your work. Simply place the yoke over the work and the strong spring holds the straddle firmly in place as you scribe your lines. The Izzy Swan Straddle Square supports work measuring 2 1/2" in height and from 1/8" up to 1 3/4" wide or 63.5 mm in height and from 3.175 mm to 44.5 mm wide.