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πŸ”© bosch cobalt metal piece co21 logo

πŸ”© Bosch Cobalt Metal Piece CO21 Review

3

Β·

Terrible

Revainrating 1.5 out of 5Β Β 
RatingΒ 
1.7
πŸͺš Industrial Drill Bits, πŸ”ͺ Cutting Tools

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Description of πŸ”© Bosch Cobalt Metal Piece CO21

TOUGH: The Bosch CO21 Drill Bit Set is manufactured from cobalt for drilling in hard and abrasive materials such as stainless, cast iron, and high-density metal. Also useful for general drilling in light-gauge metal, wood, and plastic. ACCURACY: Featuring a no-skate split-point tip for clean, precise holes and accurate starts. RELIABLE: The three-flat shank design promotes better grip and guards against slipping on bits 3/16 in. and larger. PERFORMANCE: Designed for very high drilling temperatures for superior performance in stainless steel. Bosch Cobalt Metal Drill Bits are solid, reliable, and provide 4X longer life than standard high-speed drill bits. VERSATILITY: Includes laser-etched marking to provide clearly marked bit diameter. Included bit sizes: 1/16 in. 5/64 in. 3/32 in. 7/64 in. 1/8 in. 9/64 in. 5/32 in.11/64 in. 3/16 in. 13/64 in. 7/32 in. 15/64 in. 1/4 in. 5/16 in. 3/8 in. 1/2 in.

Reviews

Global ratings 3
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Type of review

Revainrating 2 out of 5

The plastic box is good but the molded dimensions are very difficult to read.

Drill bits are ok but drill 1/4" aluminum slowly and even more slowly into a steel boat trailer. Plastic box is good but very hard to read dimensions cast in plastic They don't bite, and it was a bit of a hassle to drill into metals.They're probably good for wood and plastic, but not the best for metals.

Pros
  • Inspires confidence
Cons
  • Not fancy

Revainrating 2 out of 5

Good labels! (Add some sarcasm here!)

Disappointed before you even use it. The drills come in a nice red plastic holder. Only the drill size inscriptions are written with a thin laser, very small, part of the injection molding and in red. Why red? Because what color stands out better than red on red! I have 20/20 vision and have trouble seeing labels. Bosch is embarrassed to develop a good product and fail miserably with a poorly designed container.

Pros
  • Good product for the price
Cons
  • flimsy

Revainrating 1 out of 5

Don't buy money when drilling in hardened steel or stainless steel! Get something with an m42 rating!

Waste drill bits used to try to drill holes in steel for a custom garden tractor hitch and couldn't keep them past a few holes even when starting small and 3 increased Fold to 3/8 inch hole. We're talking hardened or stainless steel, but they're no better than standard HSS bits. Nowhere have I seen a hardness rating on them. Found from the same brand at Menards for a few bucks more, the m42 shows what is about the hardest part you can buy.

Pros
  • This is great
Cons
  • Some bugs