Rockwell RW8928 3-1/8-Inch Sonicrafter Oscillating Multitool HSS Semicircle Saw Blade with Universal Fit System 3-1/8-Inch HSS semicircle saw blade Use to make linear and plunge cuts into corners and flush against adjoining surfaces Cuts thin wood, plastic, fiberglass, non-ferrous metals, thin sheet metal, hardened fillers, and window glazing Semicircle is flat on one side Universal fit system adapts to other brands