Milwaukee Tool, 48-13-5002, Adjustable-Depth Drill Countersinks, Cutter Head Dia (Wire): #10, Cutter Head Dia (Inch): 1/4, Drill Size Compatibility (Inch): 3/16, Drill Size Compatibility (Wire): #10, Drill Size Compatibility (Decimal Inch): 0.1875, Drill Size Compatibility: 0.1875 in, Collar Thickness (Inch): 1/4