Astro 936 Onyx Gear Driven Heavy Duty Air Saw, is suitable for heavy-duty applications. It provides 250% more cutting power when compared to standard air saws. This unit can handle cutting mild steel up to ¼ inch thick quickly and easily, and it fits universal ½ inch shank saw blades. It is also compatible with Sawzall blades. This tool is used extensively in automotive, metalworking and other applications where accurate and efficient cutting of materials using compressed air is important!