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Why Choose Premium STROTON Cobalt Drill Bits?
Researches have shown that compared with HSS without cobalt, HSS with cobalt has higher temperature resistance, red hardness, wear resistance and heat treatment response.
- Red hardness, which means that the drill bits hardened steel can maintain hard at 860-880℃.
- 68 HRC,it means that the drill bits has 3X cutting ability and 3X durability.
- This drill bits set is made of True Premium Cobalt (80,000 dollars per ton).
Truly Made of 5% Cobalt Alloy Steel
- This drill bits set definitely have more cobalt in them than the "Cobalt" bits that HF sells--which are just Cobalt coated or only a tiny amount of cobalt tipped.
- Compared with ordinary high speed steel, 5% cobalt provides better heat and wear resistance,and Hold up Better.
3X Drilling Efficiency + 3X Tool Life
- Split Point desigh tip starts drilling immediately with less force and eliminates "walking" across the work surface.
- Ideal for Stainless steel,Mild Steel,Iron,Hardmetal,Aluminum,Copper,Plastic and Hardwood.
- The drill bit can be used for mechanical maintenance, such as drilling out bolts and screws.
Be vertical to the workpiece
- Non-vertical use may cause the drill bit to break.
- Using a drill press with sufficient power will make drilling easier.
Low speed: 200 to 1000 RPM
- Too high speed may burn the bit tip.
- Drill diameter≤3/16，RPM（1000~700）
- 3/16-3/8，RPM（700~350）
- 3/8-1/2，RPM（350~200）
Use cutting fluid
- Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating.
- It also works adding some vinegar,soy sauce or water.
Remain steady and patient
- The drilling shall be started slowly by applying force slowly and gently until the drill bit starts chipping.
Cash T
2025-09-06 11:28:11
Great little set for the price. They’re working good so far.
Ned L
2025-08-29 18:37:38
The drill bits seem to be good quality. I did snap one of the smaller bits which occasionally happens with any manufacturer’s bits. I followed the enclosed process for requesting a free replacement and promptly received an entire new set of 13 bits because they did not have the individual size bit that I broke. Highly recommend Stroton.
Arthur
2025-07-18 14:22:53
Good bits
Doug Vanleeuwen
2025-07-15 17:05:53
Very good bits and good price with prompt delivery
Jim
2025-06-30 13:23:16
Drills fast and clean finally drill bits that work thanks Jim
Doug P
2025-06-24 13:50:47
They wouldn’t drill my stainless exhaust on my motorcycle but I was using a Hand drill on a curved surface. Tried a small bit and then a larger one but they wouldn’t even scratch it. I tried center punching but my punch wouldn’t touch it. I gave up on drilling a hole. I was going to put a sheet metal screw through the bottom of the slip on muffler just to make sure it wouldn’t come off. It is a custom setup is why I needed to do that because the exhaust doesn’t fit the standard setup. I think they would work ok in a drill press on flat sheet stainless. They are made in China and had pretty decent reviews is why I bought them.
Patty P
2025-05-17 10:10:21
As advertised. Work great.
Ahmed Al Farsi
2025-04-24 18:40:44
Look like solid, didn't try it yet on metal but recommended
Jean Bellerive
2025-04-18 14:53:32
J'ai percé de l'acier 1/4 en 3 minutes, du stainless 1/8 en moins d'une minute et beaucoup d'autres matériaux au travail et j'ai pas été déçu. Surchauffe pas, perce sans y mettre tout le poids de son corps, mais faut savoir aussi qu'il ne faut pas y aller à pleine vitesse sur ta perceuse pour les non-initiés. Lentement mais sûrement. Thumbs Up.
Nava
2025-03-17 12:52:53
Juego de brocas, se ve bueno, digo se ve porque no las he usado, llegó rapido
anna
2025-02-14 18:23:21
Perfette per i vari lavori da fare in casa marito pienamente soddisfatto
Glendon Rafuse
2025-01-01 17:23:35
Price and product Value for the money.
Randy Richardson
2024-12-28 13:30:20
Just what I needed.
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