Step Drill Bit 4.2 mm HSS M35 Cobalt Seven Steps Length 75 mm Cylindrical Shank Drilling into Steel Iron and Stainless Steel
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The step drill bit with a diameter of 4.2 mm is designed for drilling holes in metal. It is made of high-speed steel HSS M35 with cobalt, which is used for drilling iron, structural steel, and stainless steel. The tip consists of seven small steps that gradually lead to the full diameter of the drill bit. The spiral groove removes chips from the hole during drilling. The size of 4.2 mm is suitable wherever you need a hole slightly larger than the standard four millimetres.
The drill measures a total of 75 mm, of which 42 mm constitutes the working part with the spiral. This length allows drilling into sheets, strips, and metal profiles. The cylindrical shank fits into a standard chuck of a cordless drill, handheld electric drill, or pillar drill. The diameter is marked directly on the shank, making it easy to find among others. The stepped shape of the tip is clearly visible in the detailed product photographs.
Unlike a standard spiral drill bit, this drill features seven steps with a gradually increasing diameter at the tip. The first, smallest step creates a narrow hole in the metal, and the subsequent steps gradually widen it. The full diameter of 4.2 mm penetrates the material only after passing through all the steps. The hole is created in one working step, without pre-drilling with a thinner drill bit. The traces left by the steps in the wall of the hole are shown in the detailed photographs. The drill bit is suitable for drilling into iron, common steel, and stainless steel.
- Type – step drill bit
- Diameter – 4.2 mm
- Length of Working Part – 42 mm
- Total Length – 75 mm
- Material – high-speed steel HSS M35 with cobalt content
- Tip – seven steps gradually transitioning to full diameter
- Shank – cylindrical
- Usage – drilling into iron, steel, and stainless steel
- Package Contents – 1 piece of 4.2 mm step drill bit
For drilling into steel and stainless steel, we recommend using cutting oil or coolant, which reduces overheating of the tip. Choose the speed appropriate to the diameter of the drill bit and the type of metal, and guide the drill straight, perpendicular to the surface, without excessive pressure. After use, clean the drill bit of chips and store it separately to prevent damage to the tip. Before drilling into smooth metal, mark the spot with a centre punch; this will prevent the drill from slipping on the surface, ensuring the hole is exactly where you need it.
The step drill bit 4.2 mm will expand your metal drilling toolkit with a less common size. HSS M35 steel with cobalt makes it a tool suitable for stainless steel. The tip with seven steps gradually enlarges the hole to the full diameter. The cylindrical shank can be clamped into any standard drill. The package contains one drill bit with a diameter of 4.2 mm.
Delivery
Delivery to address€1.99
Estimated delivery: 23 November – 4 December
Shipped from China
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Returns and Exchanges
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Returns30 days to return without giving a reason
Withdrawal period30 days from receipt of the goods
Deadline to send the goods backWithin 14 days of withdrawing from the contract
Return shipping costsYou pay the postage for sending the goods back to Spain. With An Post (Standard Post), returning a parcel of up to 2 kg to Spain costs about €30. We charge no other fee.
RefundWithin 14 days of your notice of withdrawal, using the same payment method you used for the purchase. If you return the whole order, we will also refund the delivery cost.
Crediting of the amountUsually 2–10 working days, depending on the payment method
Product conditionYou may unpack the goods and try them as you would in a shop, and you can return them even without the original packaging
Returns addressQX-BOX AEMALL RETURN
Rotonda Rene Descartes, Parcela 101 – Nave 3
28070 Alcala de Henares, Madrid
SpainReturns centre in Spain operated by Qxbox, an e-commerce logistics provider and logistics partner of the sellers on our platform.
How do I return goods?
- Email us at info@lunzo.ie with your order number and the items you are returning.
- Pack the goods and send them by post to the returns address in Spain.
- Send us the proof of dispatch with the tracking number – this lets us refund you without waiting for the parcel to arrive.
Faulty goodsUp to 6 years to claim for faulty goods
Did the goods arrive damaged, do they not work, is something missing from the parcel or do they not match the description? We will sort it out.
Period for claiming a faultUp to six years from delivery of the goods
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How does it work?
- Email us at info@lunzo.ie with your order number and a description of the problem, and attach photographs or a video.
- We will assess it and suggest a solution. Photographs are usually enough – please do not send the goods back until you have received instructions from us.
- We will settle your claim within 30 days at the latest – with a new item, a price reduction or a refund.
If the goods need to be sent back, we will refund the postage for a valid claim (just provide the receipt).
ExchangesA different size, colour or variant
Write to us within 30 days of receipt at info@lunzo.ie with your order number and the variant you are interested in. We usually reply within 24 hours.
If the variant is available, we will send you instructions for the exchange. You pay the cost of sending the original item back; the new variant will be sent to you at no further charge.
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About the seller
This product is sold and shipped by an external seller. LUNZO guarantees you a safe purchase: online payments go through a secure payment gateway, and you handle your order, returns and complaints with us.
The following information has been provided by the product seller, who is responsible for its accuracy. The seller acts as a trader.
Seller:
Gansu Constar Technology Group Co., Ltd.
Address: No.10, Chuangxin South Road, Baiyun District, Baiyun, Gansu, China
E-mail: ksdjt@foxmail.com
Telephone: +86 156 9392 3686
Manufacturer:
Gansu Constar Technology Group Co., Ltd.
Address: No.10, Chuangxin South Road, Baiyun District, Baiyun, Gansu, China
E-mail: ksdjt@foxmail.com
Telephone: +86 156 9392 3686
EU responsible person:
BioDomi GmbH
Address: Schokoladenring 13, 65795 Hattersheim am Main, Germany
E-mail: arcontact@biodomieurope.de
Telephone: +49 178 5749814
All products from this seller