DEWALT DT1957QZX5 DT1957QZ Construction Circular Saw Blade 250x30mm 48T DW935 DW. The Dewalt 250mm x 30mm x 48t Construction Circular Saw Blade 5pk DT1957QZ5 is ideal for professionals and DIYers. These DeWalt circular saw blades are designed for use with stationary machines to cut softwoods and composite materials.