| Customized: | Customized |
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| Standard: | Normal |
| Length: | Normal |
| Samples: |
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| Customization: |
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| Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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| Payment Method: |
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| Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Pattern Name:50pcs
Product Advantages:
(1) 3 Steps desigh tip starts drilling immediately with less force and eliminates "walking" across the work surface.
(2) Holds up better than generic high-speed steel,Cobalt gives high-speed steel more heat and wear resistance.
(3) This drill bits set is made of Premium Cobalt (80,000 dollars per ton).
(4) The Wnewtools metric cobalt drill bits can cut through Stainless steel and Hard metal,Hard wood, although they can be used for softer materials such as Aluminum,Plastic.
Some Important Tips about drilling stainless steel and hard metal:
(1)Controling the drill speed from 200 to 1000 RPM would make it easier for you to drill holes on stainless steel.
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Stainless Steel
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Drill diameter RPM
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≤5mm 1000~700
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5-10mm 700~350
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10-15mm 350~200
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(2)Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating and forming a very hard oxide layer.It also works adding some vinegar,soy sauce or water if you don't have engine oil.
Suppliers with verified business licenses
Audited Supplier 
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