Rockwell RW8928.3 Sonicrafter Oscillating Multitool 3-1/8-Inch HSS Semicircle Saw Blade with Universal Fit System, 3-Pack 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