This precision 300 mm Metric tempered stainless steel combination square blade is made in the USA by LaSquare Guaranteed to interface with Starett, Mitutoyo, PEC and Brown and Sharpe combination squares. This blade is made from tempered stainless steel and is 1.00” wide by .085” thick with a groove down one side. Blade has a brushed finish. Metric graduations have .5 mm and mm markings on both sides of the blade. Graduations are deeply precision photo etched and then black filled for easy readability.