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9/64-in 3.55mm #6 Standard High-speed steel Countersink Twist Drill Bit

Ratings & Reviews for Kobalt 9/64-in 3.55mm #6 Standard High-speed steel Countersink Twist Drill Bit

4.1
379
Review
 4.1 out of 5
382 Reviews


75% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The adjustable countersink drill bit is a versatile tool that can accommodate a range of screw sizes and allows for controlled depth adjustment. It works well on softer materials like wood and composites, but the countersink heads may wear out over time. The main strengths are its convenience and ability to drill and countersink in a single operation, making it useful for projects like cabinet and furniture installation. However, some users have reported issues with the drill bit breaking or becoming loose, especially when working with harder materials, and replacement bits can be difficult to find. Careful use and maintenance are recommended for optimal performance.

Customer review summary generated by AI, including incentivized reviews.
382 Customer Reviews

Good quality bit.

Would Recommend

Good bit. Works well. Stays sharp.

June 22, 2026
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Good

Would Recommend

Works like it should

June 22, 2026
From 4.35mm #8 Standard High-speed steel Countersink Twist Drill Bit Verified Purchaser
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Just a bit

Would Recommend

Makes a nice clean counter sink hole.

June 3, 2026
Verified Purchaser
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Good to have

Would Recommend

This is the size I use most frequently, so I’m glad to buy it individually.

May 15, 2026
From 4.35mm #8 Standard High-speed steel Countersink Twist Drill Bit Verified Purchaser
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Works well. This is the one you wanted.

Would Recommend

No dislikes

May 9, 2026
From 4.35mm #8 Standard High-speed steel Countersink Twist Drill Bit Verified Purchaser
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Nice bot

Works liked planned

May 7, 2026
Verified Purchaser
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Great tool

Would Recommend

Works great

April 28, 2026
From 1-5_SLASH_8-in High-speed steel Countersink Twist Drill Bit Verified Purchaser
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Speed and Precision.

Would Recommend

Bit has a good point for precise drilling. Fast starting, bit cleans well. Would be nice to have a stop on the countersink.

April 26, 2026
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Countersink

Would Recommend

Stocking up on drill bits for upcoming project and needed the countersink. Product is great.

April 23, 2026
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