MILWAUKEE TOOL 48-20-4050 1/2 in. x 10 in. 2-Cutter Spline Rotary Hammer Drill
$18.59
Spline Drill Bit, Spline, 1/2 in, Carbide, 10 in Overall Length, Maximum Drilling Depth 5 in, Shank Diameter 3/4 in, Shank Hex Size Not Applicable, Bright (Uncoated)