DEWALT's 4-1/2-in. x .045 in. HP Aluminum-Oxide Abrasive Chop/Cut-Off Circular Blade uses a proprietary material blend engineered for long wheel life and consistent cutting performance. Two full sheets of fiberglass reinforce the abrasive wheel, helping reduce breakage during use, while its contaminant-free formulation contains less than 0.01% iron, sulfur, and chlorine for applications where corrosion contamination matters. With a 60-grit aluminum-oxide composition and Type 1 design, this cut-off wheel is suited to metal fabrication, maintenance, installation, and general metalworking tasks requiring clean, efficient cuts.