Starrett B150-36 Combination Square Blade With Inch and Millimeter Graduations, Sets And Bevel Protractors, 19mm Width, 2mm Thickness, 150mm Size Review GreedyGangster Rulers August 28, 2018October 5, 2018Linear Measurement, Measuring & Layout Tools, Starrett, Tools & Home Improvement 0 Comment The blade fit any head according to the sizes of all combination squares, combination sets and bevel protractors.