Cobalt drill bit set (12) DWDCO series by Drill America
Cobalt steel drill bits with round shanks for versatile toolholding. Designed for harder metals with durable cutting edges; gold oxide surface treatment differs from black oxide. Customers note they stay sharp and offer good value, though some say geometry varies from description
Highlights
- cobalt for hard metals
- round shank versatility
- stays sharp per users
Pros
- cobalt steel for cutting harder metals
- round shanks for versatile toolholding
- durable edge retention noted by customers
- gold oxide surface treatment distinguishes coating
- suitable for stainless steel and nickel alloys
Cons
- mixed feedback on geometry accuracy
- some users question fit to described size
Best For
Features
- Cobalt steel offers improved performance when cutting harder metals like stainless steel or nickel alloys
- Gold oxide coating is thinner than black oxide and behaves similarly to uncoated tools
- Round shanks support compatibility with a wide range of toolholding systems
- Spiral fluted design evacuates chips when used counterclockwise (right-hand cut) to reduce clogging
- Manufactured to National Aerospace Standard 907
