Irwin 73320 Jobber Drill Bit 5/16 in Dia 4-1/2 in OAL Spiral Flute 5/16 in Dia Shank 3-Flat Shank

High-speed steel features a black body and gold flute with Turbomax tip for burr-free holes. Exact centering; no walking on straight and curved surfaces. Three flatted shank on 3/16 in and above for better chuck grip. Jobbers length.