Best in 7 days
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Ships within 48 hours · Estimated delivery Jul 26 - Jul 31
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Description
Bosch CO21B 21-Piece Cobalt M42 Drill Bit SetCobalt M42 drill bit provides upgraded M42 cobalt jobber length bits designed for durability, high heat resistance and hardened surface for stainless steel, cast iron, titanium, light gauge metal and aluminum Enhanced M42 alloy material contains 8% cobalt alloy that delivers 10X life vs. standard bits High heat resistant bits withstand high temperature applications for extended periods of time Thick web helix design provides additional stability in
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.2 ★★★★★
Based on 1602 reviews
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Product Reviews
★★★★★ 5
They do the trick. That's for sure.
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
Fantastic. They vary in thickness to accommodate different size punctures, they look nice, good value for the money, the sand out the tire and internal belt to stop leakage. and they easy enough the use.
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Reviewed in the United States on September 26, 2025
★★★★★ 5
A must for tire repair
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
Beats using a drill bit, this really is a must for tire plug, patch repair
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Reviewed in the United States on June 2, 2026
★★★★★ 5
These tire repair reamers work great for plug/other type repairs
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
These tire repair reamers work great for plug/other type repairs. Gone are the days of manually fighting a hand reamer through rough rubber. This is an efficient, neat and clean way to prepare a tire for the repair. Will purchase again as needed.
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Reviewed in the United States on November 27, 2025
★★★★★ 4
Got what I paid for.
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
I dropped my drill with the bit installed. It broke quite easily. It was a relatively inexpensive so I can't complain. A higher quality harder metal would have earned 5 stars.
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Reviewed in the United States on February 17, 2025
★★★★★ 5
Great product
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
These bits are great. We use them every day e when patching or plugging tires. Having multiple sizes helps us match the bit to the patch we use.
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Reviewed in the United States on April 17, 2026
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