Milwaukee Hole Cutter 2-1/4 in (57 mm) Model 48-25-2251 MPN 48-25-2251
Milwaukee, 2 1/4 self feed bit with set screw and no pilot
Milwaukee Hole Cutter 2-1/4 in (57 mm) Model 18-25-2251 MPN 18-25-2251
Milwaukee, 2 1/4 selfie bit with set screw but without pilot