3/8" Diameter 100 degree, 3 flute, countersink cutter with integral #12 Pilot. Fits all 1/4x28 Threaded adapters. Made of hardened high speed steel (HSS).
Specifications: 3/8" diameter (D) . 100° cutting angle (A) . 3-Flutes . 1/4-28NF thread (C) . Integral pilot