M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit
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15,192 reviews
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Jobber Drill Bits
Experiential insights by users
About M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit
Overall Feedback:
87% positive
84% appreciated its precise drilling accuracy, though 16% experienced deviation
On the 4th or 5th hole, the bit stopped cutting properly.
The drill bits are actually HSS High Speed Steel, not M35 5% Cobalt as mentioned.
84% praised for its fast drilling speed, while 16% found it slow
On the 4th or 5th hole, I noticed the drill bit stopped cutting, indicating the drilling speed was insufficient.
85% liked its long-lasting durability, but 15% experienced frequent breakage
I noticed that the cutting edge of the drill bit had burrs or roll over on one side and the grind looked a bit rough. Also, I said that the coating wore quickly in use.
The cutting edge of the drill bit had burrs or roll over on one side and the grind looked a bit rough. Additionally, the coating wore quickly in use.
Once the coating comes off, our drill bits lose their cutting ability.
83% liked the comfortable grip design, while 17% found it slippery
Once the coating comes off, the drill bit loses its cutting ability.
84% found it resistant to heat buildup, but 16% experienced thermal damage
Once the coating comes off, I lose the cutting ability of the drill bit.
I observed that the drill's cutting edge has burrs or roll over on one side and the grind looked rough.
86% praised for its versatility in drilling various materials, though 14% had difficulty with metal
Once the coating comes off, our bits lose their cutting ability.
The drill bits were not suitable for drilling aluminum as the holes were undersized and had flash at the entry hole. Also, the resultant holes were slightly out of round.
The drill bits were illustrated as M35 5% Cobalt but are actually HSS High Speed Steel. This is negative feedback from me regarding the material versatility of jobber-drill-bits.
