iGaging 4" & 6" Double Square Set 4R Steel Blade High Precision Woodworking Set of Double Squares 4" and 6" precision Double Squares 4" 4R blade with 2.5" base - 6" 4R blade with 3.75" base Blades: Heavy duty hardened, precision ground satin chrome blade Easy to read Marked increments Made to US Standard Accuracy and Squareness. Comes Storage Case, with foam insert.