Series General Purpose Single End Countersink, 3/8 in Dia Body, 1/4 in Dia Shank, 1 Flutes, 90 deg Included, 0.06 in Dia Min Cutting, HSS,61086(Pack of 1) Countersink, General Purpose Single End, Series: 61 Series, 3/8 in Body Dia, 2 in Overall Length, Straight Shank, 1/4 in Shank Dia, 0.06 in Nose Dia, 1 Flutes, Right Hand Cutting, 90 Deg Included Angle, 45 Deg Centerline Angle, 0.06 in Minimum Cutting Dia, Hss, Uncoated.