Welcome to this week’s DIY tool matchup, where we will dive into Price or quality? cobalt vs black oxide drill bits
The best cobalt vs black oxide drill bits
6 Pcs, #21 Cobalt Black Oxide Long Threaded Shank Drill Bit, Tsd21L, Number Of Flutes: 2; Cutting Direction: Right Hand, Overall Length: 2-1/8" Shank Size: 1/4"-28
out of stock
Amazon.com
as of April 27, 2026 6:53 pm
Features
- Size: #21; Material: Cobalt; Finish: Black Oxide;
- Overall Length: 2-1/8"; Shank Size: 1/4"-28;
- Shank Type: Threaded; Style: Threaded Shank;
- Cutting Angle: 135; Point Type: Split Point;
- Number of Flutes: 2; Cutting Direction: Right Hand
Drill America 1/8" High Speed Steel Black Oxide Drill Bit (Pack of 12), D/an Series
out of stock
Amazon.com
as of April 27, 2026 6:53 pm
Features
- High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
- Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
- Round shanks allow use with a wide variety of toolholding systems
- When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
- Ideal for production, maintenance or portable drilling jobs
Milwaukee Elec Tool 48-89-2305 Thunderbolt Cobalt Drill Bit, 1/8-In. - Quantity 5
out of stock
Amazon.com
as of April 27, 2026 6:53 pm
Features
| Part Number | 48-89-2305 |
| Is Adult Product |
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Price Drops Alerts
6 Pcs, #21 Cobalt Black Oxide Long Threaded Shank Drill Bit, Tsd21L, Number Of Flutes: 2; Cutting Direction: Right Hand, Overall Length: 2-1/8" Shank Size: 1/4"-28, Drill America
out of stock
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Amazon.com
Wait For A Price Drop
Price History
Statistics
| Current Price | - | April 27, 2026 |
| Highest Price | 19.10 | December 1, 2025 |
| Lowest Price | 19.10 | December 1, 2025 |
Since December 1, 2025
Last price changes
| 19.10 | December 1, 2025 |
Drill America 1/8" High Speed Steel Black Oxide Drill Bit (Pack of 12), D/an Series, Drill America
out of stock
BUY NOW
Amazon.com
Wait For A Price Drop
Price History
Statistics
| Current Price | - | April 27, 2026 |
| Highest Price | 10.10 | February 1, 2026 |
| Lowest Price | 10.10 | February 1, 2026 |
Since February 1, 2026
Last price changes
| 10.10 | February 1, 2026 |
Milwaukee Elec Tool 48-89-2305 Thunderbolt Cobalt Drill Bit, 1/8-In. - Quantity 5, Milwaukee Tool
out of stock
BUY NOW
Amazon.com
Wait For A Price Drop
Price History
Statistics
| Current Price | - | April 27, 2026 |
| Highest Price | 35.99 | December 1, 2025 |
| Lowest Price | 31.80 | October 28, 2025 |
Since October 28, 2025
Last price changes
| 35.98 | February 1, 2026 |
| 35.99 | December 7, 2025 |
| 35.98 | December 2, 2025 |
| 35.99 | December 1, 2025 |
| 33.47 | October 31, 2025 |