Milwaukee Tool, 48-13-5001, Adjustable-Depth Drill Countersinks, Cutter Head Dia (Wire): #8, Cutter Head Dia (Inch): 1/4, Drill Size Compatibility (Inch): 11/64, Drill Size Compatibility (Wire): #8, Drill Size Compatibility (Decimal Inch): 0.1719, Drill Size Compatibility: 0.1719 in, Collar Thickness (Inch): 1/4