3-1/8" segment 1/2 circle saw blade. High speed stainless steel blade for linear and plunge cutting. Flat on 1 side so you can cut into corners and flush against adjoining surfaces. Use on thin wood, plastic, fiberglass, nonferrous metals, thin sheet metal, hardened fillers, and window glazing. For use with Rockwell SoniCrafter oscillating tools. Universal fit system adapts to other brands.