Starlock, 2-1/2", Bi-Metal, Extra Clean, Plunge Cut Blade, Bi-Metal Blade With Extra-Clean Cutting Edge For Clean Cuts In Hard Wood, Curved Tec Blade Design For Greater Control & Smooth, Precise Plunge Cuts, Starlock Interface For Professional Performance, Also Works With OIS Compatible Tools Including Bosch, Fein, Milwaukee, Makita, Rigid & Others.