Benchmark Tools™ 4R Combination Square Blades

This is a replacement blade for combination squares or can be used alone as a thick, rigid rule. This blade will make an excellent upgrade of replacement for both vintage or contemporary combination squares. Note: This blade will not interface with all brands of precision combination squares, but has been shown to fit most Starett, Mitutoyo, PEC and Brown & Sharpe 12", 18", and 24" combination square heads. This combination square blade is made from Japanese rust-resistant stainless steel that has been tempered creating a very stiff measuring tool that is quite resistant to flexing. The edges and ends have been ground parallel, straight, smooth and square. There is a groove running down on one side that is 0.1" wide x 0.040" deep. Graduation marks are produced via a photoengraving process creating very consistent and accurate markings with uniform gaps and line widths. Once etched, graduations are black filled for easy readability. Graduations are etched and not printed will not we