21/64″ Stub Drill Bit Cobalt Split Point D/ASTCO21/64 (6 / Pkg.) Luxury

[6 PKG] 21/64″ Cobalt Split Point Stub Drill Bit is a cobalt-alloy high-speed steel bit designed for demanding metalworking tasks. This description provides the key specs, practical features, and physical attributes to help you evaluate its fit for your projects.

Specs

Diameter: 21/64 in (0.3281 in)

Material: HSS cobalt alloy (cobalt‑enhanced high‑speed steel)

Tip: Split point for self-centering start

Length: Stub drill length (short overall length)

Pack: 6 pieces per package

Features

Split-point tip: Self-centering and reduces walking when starting holes, minimizing need for center punching

Cobalt alloy: Improves red-hardness and heat resistance for sustained cutting life in hard metals

Stub length: Increased rigidity and reduced deflection in tight spaces or plunging work

Chipping and heat management: Flute geometry supports efficient chip evacuation and temperature control during drilling

Metalworking priority: Well-suited for stainless steel, hardened alloys, cast iron, and other tough metals

Physical

Pack size: 6 bits per package

Bit construction: Cobalt‑based HSS construction with a stub geometry for rigidity

Intended use scenario: Precision drilling in metalworking environments where starting accuracy and heat resistance matter