COMOWARE Left Hand Drill Bit Set, 13 Piece
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About COMOWARE Left Hand Drill Bit Set, 13 Piece
Overall Feedback:
90% positive
94% appreciated its precise drilling accuracy, though 6% experienced deviation
The relief angle should be between 5 to 15 and our drill bits appear to be less than 5.
After close inspection, I found that some of the bits had unacceptably machined cutting edges for the price.
I've noticed that the drill bits go blunt at the first contact with metal.
95% praised for its fast drilling speed, while 5% found it slow
I was initially skeptical because I had really cranked the brass in hard, but it took no effort for the bit to extract the remaining stud right away.
I noticed that the reverse bit dulled within the first 20 seconds, indicating that it was not effective in drilling.
The reverse bit dulled within the first 20 seconds, indicating its ineffectiveness in drilling.
94% liked its long-lasting durability, but 6% experienced frequent breakage
I cannot comment on the longevity, but the bit I used still seems intact.
88% praised for its versatility in drilling various materials, though 12% had difficulty with metal
I am unhappy with the material used to make the drill bits. They are made of black and gold HSS instead of cobalt, which is not suitable for my primary use of extracting screws and bolts.
I found that the drills were ineffective on hard steel bolts, making only useless noise without any impression.
I noticed that the drills look well-made, but the relief angle is very shallow, which may affect their performance.
Response after rephrasing:
The drills look well-made, but the relief angle is very shallow, which may affect their performance.
