# Drill bits Proline 78042K, metal, Ø 4.2 mm, length 75 mm, 2 pcs

**URL:** https://aio.lv/en/product--proline-78042k--11718243
**Data updated:** 2026-03-08 11:19 (EET)
**Category:** Drill Bits
**Manufacturer:** Proline
**Manufacturer code:** 78042K
**EAN:** 5903755153920
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 5.36 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-78042k--11718243

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Proline 78042K drill bit set for metal includes two high-precision bits with a diameter of 4.2 mm and length 75 mm. Designed for drilling metal sheets and thin-walled parts, these straight shank bits suit handheld drills and drill presses. Suitable for general metalworking tasks, fastening preparations and maintenance work.

## Long description

Proline 78042K drill bits for metal are a set of two high-precision HSS-Co bits with a diameter of 4.2 mm and overall length 75 mm. Designed for drilling metal sheets and thin-walled parts, these straight-shank bits fit handheld drills and drill presses. The 135° point angle with chamfering adjustment allows faster penetration and reduced walking at the start, while the fully ground flutes ensure accurate, straight holes. Made from high-class high-speed steel with 5% cobalt, the bits offer improved heat resistance and durability when working with demanding alloys.
Advantages
The 135° point geometry combined with chamfering reduces the need for center punching and improves centring on metal surfaces. Cobalt-enriched HSS composition increases resistance to elevated temperatures, extending tool life during prolonged cutting. Full grinding production delivers consistent diameter accuracy and rectilinearity, which is important for precision fastening and maintenance tasks. The straight shank design provides compatibility with a wide range of chucks and drill holders.
Suitable for
Drilling high-alloy and stainless steels
Working with titanium, acid-resistant and creep-resisting steels
Creating holes in metal sheets and thin-walled components
General metalworking, assembly and maintenance tasks
Key specifications
Material: high-speed steel (HSS) with 5% cobalt
Diameter: 4.2 mm
Overall length: 75 mm
Point angle: 135° with chamfering provision
Manufacturing: fully ground flutes for high accuracy
Intended materials: high-alloy steels, stainless and acid-resistant steels, titanium, cast iron and other hard-to-machine metals
Package contents: 2 pieces per blister pack
How to use
Secure the correct drill bit in the chuck of a handheld drill or drill press, ensuring the straight shank is held firmly and runs true. Mark the drilling position and, if necessary, use the chamfering feature or a small pilot mark to improve centring. Select appropriate cutting speed and feed rate for the workpiece material; lower speeds are recommended for hard alloys and stainless steels. Use cutting fluid or coolant when drilling tougher materials to reduce heat build-up and prolong bit life. Withdraw periodically to clear chips and prevent clogging.
Usage recommendations
For best results when drilling stainless or high-alloy steels, use moderate spindle speed, steady feed and a suitable cutting fluid. Replace worn bits to maintain hole quality; the 135° point reduces walking but correct setup and steady pressure remain essential for precision holes.

## Specifications

| Feature | Value |
|---|---|
| Length | 75 mm |
| Metal drill bits diameter | 4.2 |
| Number of drill bits | 2 pc(s) |

## FAQ

### How much does the Drill bits Proline 78042K Ø4.2 mm 75 mm, 2 pcs cost, and is it available for purchase?

The price is 6.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 200 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 06.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Proline products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Proline service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11718243/67198205_large.webp