5-Piece Non-Tapered Countersink Hex Shank Drill Bit Set

Bit and Countersink Collar Material : 4341 High Speed Steel

Drill Bits: Polished 4341 HSS steel, Tapered drill bit flute from tip (narrow) to shank (widest), 1/4″ Quick Change Hex Shank – Black Oxide Coated. Drill Bit Size Laser Etched on 1/4″ Shank.